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Resurrect heap_deformtuple(), this time implemented as a singly nested
loop over the fields instead of a loop around heap_getattr. This is considerably faster (O(N) instead of O(N^2)) when there are nulls or varlena fields, since those prevent use of attcacheoff. Replace loops over heap_getattr with heap_deformtuple in situations where all or most of the fields have to be fetched, such as printtup and tuptoaster. Profiling done more than a year ago shows that this should be a nice win for situations involving many-column tables.
This commit is contained in:
Tom Lane
parent
af44cac6ef
commit
8f2ea8b7b5
@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/common/heaptuple.c,v 1.90 2004/04/01 21:28:43 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/access/common/heaptuple.c,v 1.91 2004/06/04 20:35:21 tgl Exp $
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*
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* NOTES
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* The old interface functions have been converted to macros
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@ -37,10 +37,10 @@
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*/
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Size
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ComputeDataSize(TupleDesc tupleDesc,
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Datum *value,
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Datum *values,
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char *nulls)
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{
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uint32 data_length = 0;
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Size data_length = 0;
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int i;
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int numberOfAttributes = tupleDesc->natts;
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Form_pg_attribute *att = tupleDesc->attrs;
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@ -51,7 +51,7 @@ ComputeDataSize(TupleDesc tupleDesc,
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continue;
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data_length = att_align(data_length, att[i]->attalign);
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data_length = att_addlength(data_length, att[i]->attlen, value[i]);
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data_length = att_addlength(data_length, att[i]->attlen, values[i]);
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}
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return data_length;
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@ -59,19 +59,20 @@ ComputeDataSize(TupleDesc tupleDesc,
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/* ----------------
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* DataFill
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*
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* Load data portion of a tuple from values/nulls arrays
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* ----------------
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*/
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void
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DataFill(char *data,
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TupleDesc tupleDesc,
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Datum *value,
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Datum *values,
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char *nulls,
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uint16 *infomask,
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bits8 *bit)
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{
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bits8 *bitP = 0;
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int bitmask = 0;
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Size data_length;
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bits8 *bitP;
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int bitmask;
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int i;
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int numberOfAttributes = tupleDesc->natts;
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Form_pg_attribute *att = tupleDesc->attrs;
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@ -81,11 +82,19 @@ DataFill(char *data,
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bitP = &bit[-1];
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bitmask = CSIGNBIT;
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}
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else
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{
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/* just to keep compiler quiet */
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bitP = NULL;
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bitmask = 0;
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}
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*infomask &= ~(HEAP_HASNULL | HEAP_HASVARWIDTH | HEAP_HASEXTENDED);
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for (i = 0; i < numberOfAttributes; i++)
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{
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Size data_length;
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if (bit != NULL)
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{
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if (bitmask != CSIGNBIT)
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@ -112,33 +121,33 @@ DataFill(char *data,
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if (att[i]->attbyval)
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{
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/* pass-by-value */
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store_att_byval(data, value[i], att[i]->attlen);
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store_att_byval(data, values[i], att[i]->attlen);
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data_length = att[i]->attlen;
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}
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else if (att[i]->attlen == -1)
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{
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/* varlena */
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*infomask |= HEAP_HASVARWIDTH;
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if (VARATT_IS_EXTERNAL(value[i]))
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if (VARATT_IS_EXTERNAL(values[i]))
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*infomask |= HEAP_HASEXTERNAL;
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if (VARATT_IS_COMPRESSED(value[i]))
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if (VARATT_IS_COMPRESSED(values[i]))
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*infomask |= HEAP_HASCOMPRESSED;
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data_length = VARATT_SIZE(DatumGetPointer(value[i]));
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memcpy(data, DatumGetPointer(value[i]), data_length);
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data_length = VARATT_SIZE(DatumGetPointer(values[i]));
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memcpy(data, DatumGetPointer(values[i]), data_length);
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}
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else if (att[i]->attlen == -2)
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{
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/* cstring */
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*infomask |= HEAP_HASVARWIDTH;
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data_length = strlen(DatumGetCString(value[i])) + 1;
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memcpy(data, DatumGetPointer(value[i]), data_length);
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data_length = strlen(DatumGetCString(values[i])) + 1;
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memcpy(data, DatumGetPointer(values[i]), data_length);
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}
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else
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{
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/* fixed-length pass-by-reference */
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Assert(att[i]->attlen > 0);
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data_length = att[i]->attlen;
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memcpy(data, DatumGetPointer(value[i]), data_length);
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memcpy(data, DatumGetPointer(values[i]), data_length);
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}
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data += data_length;
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@ -160,27 +169,28 @@ heap_attisnull(HeapTuple tup, int attnum)
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if (attnum > (int) tup->t_data->t_natts)
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return 1;
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if (HeapTupleNoNulls(tup))
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return 0;
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if (attnum > 0)
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{
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if (HeapTupleNoNulls(tup))
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return 0;
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return att_isnull(attnum - 1, tup->t_data->t_bits);
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else
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switch (attnum)
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{
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case TableOidAttributeNumber:
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case SelfItemPointerAttributeNumber:
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case ObjectIdAttributeNumber:
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case MinTransactionIdAttributeNumber:
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case MinCommandIdAttributeNumber:
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case MaxTransactionIdAttributeNumber:
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case MaxCommandIdAttributeNumber:
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/* these are never null */
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break;
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}
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default:
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elog(ERROR, "invalid attnum: %d", attnum);
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}
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switch (attnum)
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{
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case TableOidAttributeNumber:
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case SelfItemPointerAttributeNumber:
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case ObjectIdAttributeNumber:
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case MinTransactionIdAttributeNumber:
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case MinCommandIdAttributeNumber:
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case MaxTransactionIdAttributeNumber:
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case MaxCommandIdAttributeNumber:
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/* these are never null */
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break;
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default:
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elog(ERROR, "invalid attnum: %d", attnum);
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}
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return 0;
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}
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@ -202,6 +212,8 @@ heap_attisnull(HeapTuple tup, int attnum)
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* perform well for queries which hit large #'s of tuples. After
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* you cache the offsets once, examining all the other tuples using
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* the same attribute descriptor will go much quicker. -cim 5/4/91
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*
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* NOTE: if you need to change this code, see also heap_deformtuple.
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* ----------------
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*/
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Datum
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@ -536,53 +548,18 @@ heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest)
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memcpy((char *) dest->t_data, (char *) src->t_data, src->t_len);
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}
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#ifdef NOT_USED
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/* ----------------
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* heap_deformtuple
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*
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* the inverse of heap_formtuple (see below)
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* ----------------
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*/
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void
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heap_deformtuple(HeapTuple tuple,
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TupleDesc tdesc,
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Datum *values,
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char *nulls)
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{
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int i;
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int natts;
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Assert(HeapTupleIsValid(tuple));
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natts = tuple->t_natts;
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for (i = 0; i < natts; i++)
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{
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bool isnull;
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values[i] = heap_getattr(tuple,
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i + 1,
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tdesc,
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&isnull);
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if (isnull)
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nulls[i] = 'n';
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else
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nulls[i] = ' ';
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}
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}
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#endif
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/* ----------------
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* heap_formtuple
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*
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* constructs a tuple from the given *value and *nulls arrays
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* construct a tuple from the given values[] and nulls[] arrays
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*
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* Null attributes are indicated by a 'n' in the appropriate byte
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* of *nulls. Non-null attributes are indicated by a ' ' (space).
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* of nulls[]. Non-null attributes are indicated by a ' ' (space).
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* ----------------
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*/
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HeapTuple
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heap_formtuple(TupleDesc tupleDescriptor,
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Datum *value,
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Datum *values,
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char *nulls)
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{
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HeapTuple tuple; /* return tuple */
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@ -621,7 +598,7 @@ heap_formtuple(TupleDesc tupleDescriptor,
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hoff = len = MAXALIGN(len); /* align user data safely */
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len += ComputeDataSize(tupleDescriptor, value, nulls);
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len += ComputeDataSize(tupleDescriptor, values, nulls);
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/*
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* Allocate and zero the space needed. Note that the tuple body and
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@ -651,7 +628,7 @@ heap_formtuple(TupleDesc tupleDescriptor,
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DataFill((char *) td + hoff,
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tupleDescriptor,
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value,
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values,
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nulls,
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&td->t_infomask,
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(hasnull ? td->t_bits : NULL));
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@ -664,68 +641,59 @@ heap_formtuple(TupleDesc tupleDescriptor,
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*
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* forms a new tuple from an old tuple and a set of replacement values.
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* returns a new palloc'ed tuple.
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*
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* XXX it is misdesign that this is passed a Relation and not just a
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* TupleDesc to describe the tuple structure.
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* ----------------
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*/
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HeapTuple
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heap_modifytuple(HeapTuple tuple,
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Relation relation,
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Datum *replValue,
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char *replNull,
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char *repl)
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Datum *replValues,
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char *replNulls,
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char *replActions)
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{
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TupleDesc tupleDesc = RelationGetDescr(relation);
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int numberOfAttributes = tupleDesc->natts;
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int attoff;
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int numberOfAttributes;
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Datum *value;
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Datum *values;
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char *nulls;
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bool isNull;
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HeapTuple newTuple;
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/*
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* sanity checks
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*/
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Assert(HeapTupleIsValid(tuple));
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Assert(RelationIsValid(relation));
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Assert(PointerIsValid(replValue));
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Assert(PointerIsValid(replNull));
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Assert(PointerIsValid(repl));
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numberOfAttributes = RelationGetForm(relation)->relnatts;
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/*
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* allocate and fill *value and *nulls arrays from either the tuple or
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* allocate and fill values and nulls arrays from either the tuple or
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* the repl information, as appropriate.
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*
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* NOTE: it's debatable whether to use heap_deformtuple() here or
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* just heap_getattr() only the non-replaced colums. The latter could
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* win if there are many replaced columns and few non-replaced ones.
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* However, heap_deformtuple costs only O(N) while the heap_getattr
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* way would cost O(N^2) if there are many non-replaced columns, so it
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* seems better to err on the side of linear cost.
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*/
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value = (Datum *) palloc(numberOfAttributes * sizeof(Datum));
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values = (Datum *) palloc(numberOfAttributes * sizeof(Datum));
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nulls = (char *) palloc(numberOfAttributes * sizeof(char));
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heap_deformtuple(tuple, tupleDesc, values, nulls);
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for (attoff = 0; attoff < numberOfAttributes; attoff++)
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{
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if (repl[attoff] == ' ')
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if (replActions[attoff] == 'r')
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{
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value[attoff] = heap_getattr(tuple,
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AttrOffsetGetAttrNumber(attoff),
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RelationGetDescr(relation),
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&isNull);
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nulls[attoff] = (isNull) ? 'n' : ' ';
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values[attoff] = replValues[attoff];
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nulls[attoff] = replNulls[attoff];
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}
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else if (repl[attoff] == 'r')
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{
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value[attoff] = replValue[attoff];
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nulls[attoff] = replNull[attoff];
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}
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else
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elog(ERROR, "unrecognized replace flag: %d", (int) repl[attoff]);
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else if (replActions[attoff] != ' ')
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elog(ERROR, "unrecognized replace flag: %d",
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(int) replActions[attoff]);
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}
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/*
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* create a new tuple from the *values and *nulls arrays
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* create a new tuple from the values and nulls arrays
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*/
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newTuple = heap_formtuple(RelationGetDescr(relation),
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value,
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nulls);
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newTuple = heap_formtuple(tupleDesc, values, nulls);
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pfree(value);
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pfree(values);
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pfree(nulls);
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/*
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@ -735,12 +703,96 @@ heap_modifytuple(HeapTuple tuple,
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newTuple->t_data->t_ctid = tuple->t_data->t_ctid;
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newTuple->t_self = tuple->t_self;
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newTuple->t_tableOid = tuple->t_tableOid;
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if (relation->rd_rel->relhasoids)
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if (tupleDesc->tdhasoid)
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HeapTupleSetOid(newTuple, HeapTupleGetOid(tuple));
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return newTuple;
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}
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/* ----------------
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* heap_deformtuple
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*
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* Given a tuple, extract data into values/nulls arrays; this is
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* the inverse of heap_formtuple.
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*
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* Storage for the values/nulls arrays is provided by the caller;
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* it should be sized according to tupleDesc->natts not tuple->t_natts.
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*
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* Note that for pass-by-reference datatypes, the pointer placed
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* in the Datum will point into the given tuple.
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*
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* When all or most of a tuple's fields need to be extracted,
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* this routine will be significantly quicker than a loop around
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* heap_getattr; the loop will become O(N^2) as soon as any
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* noncacheable attribute offsets are involved.
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* ----------------
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*/
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void
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heap_deformtuple(HeapTuple tuple,
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TupleDesc tupleDesc,
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Datum *values,
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char *nulls)
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{
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HeapTupleHeader tup = tuple->t_data;
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Form_pg_attribute *att = tupleDesc->attrs;
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int tdesc_natts = tupleDesc->natts;
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int natts; /* number of atts to extract */
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int attnum;
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char *tp; /* ptr to tuple data */
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long off; /* offset in tuple data */
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bits8 *bp = tup->t_bits; /* ptr to null bitmask in tuple */
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bool slow = false; /* can we use/set attcacheoff? */
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natts = tup->t_natts;
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/* This min() operation is pure paranoia */
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natts = Min(natts, tdesc_natts);
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tp = (char *) tup + tup->t_hoff;
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off = 0;
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for (attnum = 0; attnum < natts; attnum++)
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{
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if (HeapTupleHasNulls(tuple) && att_isnull(attnum, bp))
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{
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values[attnum] = (Datum) 0;
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nulls[attnum] = 'n';
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slow = true; /* can't use attcacheoff anymore */
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continue;
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}
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nulls[attnum] = ' ';
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if (!slow && att[attnum]->attcacheoff >= 0)
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{
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off = att[attnum]->attcacheoff;
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}
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else
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{
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off = att_align(off, att[attnum]->attalign);
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if (!slow)
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att[attnum]->attcacheoff = off;
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}
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values[attnum] = fetchatt(att[attnum], tp + off);
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off = att_addlength(off, att[attnum]->attlen, tp + off);
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if (att[attnum]->attlen <= 0)
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slow = true; /* can't use attcacheoff anymore */
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}
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/*
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* If tuple doesn't have all the atts indicated by tupleDesc, read
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* the rest as null
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*/
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for (; attnum < tdesc_natts; attnum++)
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{
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values[attnum] = (Datum) 0;
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nulls[attnum] = 'n';
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}
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}
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/* ----------------
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* heap_freetuple
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@ -9,7 +9,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/common/printtup.c,v 1.81 2004/05/26 04:41:03 neilc Exp $
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* $PostgreSQL: pgsql/src/backend/access/common/printtup.c,v 1.82 2004/06/04 20:35:21 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -65,6 +65,8 @@ typedef struct
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TupleDesc attrinfo; /* The attr info we are set up for */
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int nattrs;
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PrinttupAttrInfo *myinfo; /* Cached info about each attr */
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Datum *values; /* preallocated space for deformtuple */
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char *nulls;
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} DR_printtup;
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/* ----------------
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@ -103,6 +105,8 @@ printtup_create_DR(CommandDest dest, Portal portal)
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self->attrinfo = NULL;
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self->nattrs = 0;
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self->myinfo = NULL;
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self->values = NULL;
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self->nulls = NULL;
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return (DestReceiver *) self;
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}
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@ -243,15 +247,27 @@ printtup_prepare_info(DR_printtup *myState, TupleDesc typeinfo, int numAttrs)
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int16 *formats = myState->portal->formats;
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int i;
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/* get rid of any old data */
|
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if (myState->myinfo)
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pfree(myState->myinfo); /* get rid of any old data */
|
||||
pfree(myState->myinfo);
|
||||
myState->myinfo = NULL;
|
||||
if (myState->values)
|
||||
pfree(myState->values);
|
||||
myState->values = NULL;
|
||||
if (myState->nulls)
|
||||
pfree(myState->nulls);
|
||||
myState->nulls = NULL;
|
||||
|
||||
myState->attrinfo = typeinfo;
|
||||
myState->nattrs = numAttrs;
|
||||
if (numAttrs <= 0)
|
||||
return;
|
||||
|
||||
myState->myinfo = (PrinttupAttrInfo *)
|
||||
palloc0(numAttrs * sizeof(PrinttupAttrInfo));
|
||||
myState->values = (Datum *) palloc(numAttrs * sizeof(Datum));
|
||||
myState->nulls = (char *) palloc(numAttrs * sizeof(char));
|
||||
|
||||
for (i = 0; i < numAttrs; i++)
|
||||
{
|
||||
PrinttupAttrInfo *thisState = myState->myinfo + i;
|
||||
@ -297,6 +313,11 @@ printtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
if (myState->attrinfo != typeinfo || myState->nattrs != natts)
|
||||
printtup_prepare_info(myState, typeinfo, natts);
|
||||
|
||||
/*
|
||||
* deconstruct the tuple (faster than a heap_getattr loop)
|
||||
*/
|
||||
heap_deformtuple(tuple, typeinfo, myState->values, myState->nulls);
|
||||
|
||||
/*
|
||||
* Prepare a DataRow message
|
||||
*/
|
||||
@ -310,12 +331,10 @@ printtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
for (i = 0; i < natts; ++i)
|
||||
{
|
||||
PrinttupAttrInfo *thisState = myState->myinfo + i;
|
||||
Datum origattr,
|
||||
Datum origattr = myState->values[i],
|
||||
attr;
|
||||
bool isnull;
|
||||
|
||||
origattr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
|
||||
if (isnull)
|
||||
if (myState->nulls[i] == 'n')
|
||||
{
|
||||
pq_sendint(&buf, -1, 4);
|
||||
continue;
|
||||
@ -383,6 +402,11 @@ printtup_20(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
if (myState->attrinfo != typeinfo || myState->nattrs != natts)
|
||||
printtup_prepare_info(myState, typeinfo, natts);
|
||||
|
||||
/*
|
||||
* deconstruct the tuple (faster than a heap_getattr loop)
|
||||
*/
|
||||
heap_deformtuple(tuple, typeinfo, myState->values, myState->nulls);
|
||||
|
||||
/*
|
||||
* tell the frontend to expect new tuple data (in ASCII style)
|
||||
*/
|
||||
@ -395,7 +419,7 @@ printtup_20(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
k = 1 << 7;
|
||||
for (i = 0; i < natts; ++i)
|
||||
{
|
||||
if (!heap_attisnull(tuple, i + 1))
|
||||
if (myState->nulls[i] != 'n')
|
||||
j |= k; /* set bit if not null */
|
||||
k >>= 1;
|
||||
if (k == 0) /* end of byte? */
|
||||
@ -414,13 +438,11 @@ printtup_20(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
for (i = 0; i < natts; ++i)
|
||||
{
|
||||
PrinttupAttrInfo *thisState = myState->myinfo + i;
|
||||
Datum origattr,
|
||||
Datum origattr = myState->values[i],
|
||||
attr;
|
||||
bool isnull;
|
||||
char *outputstr;
|
||||
|
||||
origattr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
|
||||
if (isnull)
|
||||
if (myState->nulls[i] == 'n')
|
||||
continue;
|
||||
|
||||
Assert(thisState->format == 0);
|
||||
@ -461,6 +483,13 @@ printtup_shutdown(DestReceiver *self)
|
||||
if (myState->myinfo)
|
||||
pfree(myState->myinfo);
|
||||
myState->myinfo = NULL;
|
||||
if (myState->values)
|
||||
pfree(myState->values);
|
||||
myState->values = NULL;
|
||||
if (myState->nulls)
|
||||
pfree(myState->nulls);
|
||||
myState->nulls = NULL;
|
||||
|
||||
myState->attrinfo = NULL;
|
||||
}
|
||||
|
||||
@ -587,6 +616,11 @@ printtup_internal_20(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
if (myState->attrinfo != typeinfo || myState->nattrs != natts)
|
||||
printtup_prepare_info(myState, typeinfo, natts);
|
||||
|
||||
/*
|
||||
* deconstruct the tuple (faster than a heap_getattr loop)
|
||||
*/
|
||||
heap_deformtuple(tuple, typeinfo, myState->values, myState->nulls);
|
||||
|
||||
/*
|
||||
* tell the frontend to expect new tuple data (in binary style)
|
||||
*/
|
||||
@ -599,7 +633,7 @@ printtup_internal_20(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
k = 1 << 7;
|
||||
for (i = 0; i < natts; ++i)
|
||||
{
|
||||
if (!heap_attisnull(tuple, i + 1))
|
||||
if (myState->nulls[i] != 'n')
|
||||
j |= k; /* set bit if not null */
|
||||
k >>= 1;
|
||||
if (k == 0) /* end of byte? */
|
||||
@ -618,13 +652,11 @@ printtup_internal_20(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
||||
for (i = 0; i < natts; ++i)
|
||||
{
|
||||
PrinttupAttrInfo *thisState = myState->myinfo + i;
|
||||
Datum origattr,
|
||||
Datum origattr = myState->values[i],
|
||||
attr;
|
||||
bool isnull;
|
||||
bytea *outputbytes;
|
||||
|
||||
origattr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
|
||||
if (isnull)
|
||||
if (myState->nulls[i] == 'n')
|
||||
continue;
|
||||
|
||||
Assert(thisState->format == 1);
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.41 2003/11/29 19:51:40 pgsql Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.42 2004/06/04 20:35:21 tgl Exp $
|
||||
*
|
||||
*
|
||||
* INTERFACE ROUTINES
|
||||
@ -281,15 +281,26 @@ toast_delete(Relation rel, HeapTuple oldtup)
|
||||
Form_pg_attribute *att;
|
||||
int numAttrs;
|
||||
int i;
|
||||
Datum value;
|
||||
bool isnull;
|
||||
Datum toast_values[MaxHeapAttributeNumber];
|
||||
char toast_nulls[MaxHeapAttributeNumber];
|
||||
|
||||
/*
|
||||
* Get the tuple descriptor, the number of and attribute descriptors.
|
||||
* Get the tuple descriptor and break down the tuple into fields.
|
||||
*
|
||||
* NOTE: it's debatable whether to use heap_deformtuple() here or
|
||||
* just heap_getattr() only the varlena columns. The latter could
|
||||
* win if there are few varlena columns and many non-varlena ones.
|
||||
* However, heap_deformtuple costs only O(N) while the heap_getattr
|
||||
* way would cost O(N^2) if there are many varlena columns, so it
|
||||
* seems better to err on the side of linear cost. (We won't even
|
||||
* be here unless there's at least one varlena column, by the way.)
|
||||
*/
|
||||
tupleDesc = rel->rd_att;
|
||||
numAttrs = tupleDesc->natts;
|
||||
att = tupleDesc->attrs;
|
||||
numAttrs = tupleDesc->natts;
|
||||
|
||||
Assert(numAttrs <= MaxHeapAttributeNumber);
|
||||
heap_deformtuple(oldtup, tupleDesc, toast_values, toast_nulls);
|
||||
|
||||
/*
|
||||
* Check for external stored attributes and delete them from the
|
||||
@ -299,8 +310,9 @@ toast_delete(Relation rel, HeapTuple oldtup)
|
||||
{
|
||||
if (att[i]->attlen == -1)
|
||||
{
|
||||
value = heap_getattr(oldtup, i + 1, tupleDesc, &isnull);
|
||||
if (!isnull && VARATT_IS_EXTERNAL(value))
|
||||
Datum value = toast_values[i];
|
||||
|
||||
if (toast_nulls[i] != 'n' && VARATT_IS_EXTERNAL(value))
|
||||
toast_delete_datum(rel, value);
|
||||
}
|
||||
}
|
||||
@ -321,8 +333,6 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
Form_pg_attribute *att;
|
||||
int numAttrs;
|
||||
int i;
|
||||
bool old_isnull;
|
||||
bool new_isnull;
|
||||
|
||||
bool need_change = false;
|
||||
bool need_free = false;
|
||||
@ -333,18 +343,24 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
|
||||
char toast_action[MaxHeapAttributeNumber];
|
||||
char toast_nulls[MaxHeapAttributeNumber];
|
||||
char toast_oldnulls[MaxHeapAttributeNumber];
|
||||
Datum toast_values[MaxHeapAttributeNumber];
|
||||
Datum toast_oldvalues[MaxHeapAttributeNumber];
|
||||
int32 toast_sizes[MaxHeapAttributeNumber];
|
||||
bool toast_free[MaxHeapAttributeNumber];
|
||||
bool toast_delold[MaxHeapAttributeNumber];
|
||||
|
||||
/*
|
||||
* Get the tuple descriptor, the number of and attribute descriptors
|
||||
* and the location of the tuple values.
|
||||
* Get the tuple descriptor and break down the tuple(s) into fields.
|
||||
*/
|
||||
tupleDesc = rel->rd_att;
|
||||
numAttrs = tupleDesc->natts;
|
||||
att = tupleDesc->attrs;
|
||||
numAttrs = tupleDesc->natts;
|
||||
|
||||
Assert(numAttrs <= MaxHeapAttributeNumber);
|
||||
heap_deformtuple(newtup, tupleDesc, toast_values, toast_nulls);
|
||||
if (oldtup != NULL)
|
||||
heap_deformtuple(oldtup, tupleDesc, toast_oldvalues, toast_oldnulls);
|
||||
|
||||
/* ----------
|
||||
* Then collect information about the values given
|
||||
@ -353,12 +369,15 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
* ' ' default handling
|
||||
* 'p' already processed --- don't touch it
|
||||
* 'x' incompressible, but OK to move off
|
||||
*
|
||||
* NOTE: toast_sizes[i] is only made valid for varlena attributes with
|
||||
* toast_action[i] different from 'p'.
|
||||
* ----------
|
||||
*/
|
||||
memset(toast_action, ' ', numAttrs * sizeof(char));
|
||||
memset(toast_nulls, ' ', numAttrs * sizeof(char));
|
||||
memset(toast_free, 0, numAttrs * sizeof(bool));
|
||||
memset(toast_delold, 0, numAttrs * sizeof(bool));
|
||||
|
||||
for (i = 0; i < numAttrs; i++)
|
||||
{
|
||||
varattrib *old_value;
|
||||
@ -369,27 +388,24 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
/*
|
||||
* For UPDATE get the old and new values of this attribute
|
||||
*/
|
||||
old_value = (varattrib *) DatumGetPointer(
|
||||
heap_getattr(oldtup, i + 1, tupleDesc, &old_isnull));
|
||||
toast_values[i] =
|
||||
heap_getattr(newtup, i + 1, tupleDesc, &new_isnull);
|
||||
old_value = (varattrib *) DatumGetPointer(toast_oldvalues[i]);
|
||||
new_value = (varattrib *) DatumGetPointer(toast_values[i]);
|
||||
|
||||
/*
|
||||
* If the old value is an external stored one, check if it has
|
||||
* changed so we have to delete it later.
|
||||
*/
|
||||
if (!old_isnull && att[i]->attlen == -1 &&
|
||||
if (att[i]->attlen == -1 && toast_oldnulls[i] != 'n' &&
|
||||
VARATT_IS_EXTERNAL(old_value))
|
||||
{
|
||||
if (new_isnull || !VARATT_IS_EXTERNAL(new_value) ||
|
||||
if (toast_nulls[i] == 'n' || !VARATT_IS_EXTERNAL(new_value) ||
|
||||
old_value->va_content.va_external.va_valueid !=
|
||||
new_value->va_content.va_external.va_valueid ||
|
||||
old_value->va_content.va_external.va_toastrelid !=
|
||||
new_value->va_content.va_external.va_toastrelid)
|
||||
{
|
||||
/*
|
||||
* The old external store value isn't needed any more
|
||||
* The old external stored value isn't needed any more
|
||||
* after the update
|
||||
*/
|
||||
toast_delold[i] = true;
|
||||
@ -413,23 +429,21 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
/*
|
||||
* For INSERT simply get the new value
|
||||
*/
|
||||
toast_values[i] =
|
||||
heap_getattr(newtup, i + 1, tupleDesc, &new_isnull);
|
||||
new_value = (varattrib *) DatumGetPointer(toast_values[i]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Handle NULL attributes
|
||||
*/
|
||||
if (new_isnull)
|
||||
if (toast_nulls[i] == 'n')
|
||||
{
|
||||
toast_action[i] = 'p';
|
||||
toast_nulls[i] = 'n';
|
||||
has_nulls = true;
|
||||
continue;
|
||||
}
|
||||
|
||||
/*
|
||||
* Now look at varsize attributes
|
||||
* Now look at varlena attributes
|
||||
*/
|
||||
if (att[i]->attlen == -1)
|
||||
{
|
||||
@ -461,10 +475,9 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
else
|
||||
{
|
||||
/*
|
||||
* Not a variable size attribute, plain storage always
|
||||
* Not a varlena attribute, plain storage always
|
||||
*/
|
||||
toast_action[i] = 'p';
|
||||
toast_sizes[i] = att[i]->attlen;
|
||||
}
|
||||
}
|
||||
|
||||
@ -768,8 +781,7 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
if (need_delold)
|
||||
for (i = 0; i < numAttrs; i++)
|
||||
if (toast_delold[i])
|
||||
toast_delete_datum(rel,
|
||||
heap_getattr(oldtup, i + 1, tupleDesc, &old_isnull));
|
||||
toast_delete_datum(rel, toast_oldvalues[i]);
|
||||
}
|
||||
|
||||
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.109 2004/06/02 21:01:08 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.110 2004/06/04 20:35:21 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -2342,10 +2342,10 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
|
||||
newslot = MakeTupleTableSlot();
|
||||
ExecSetSlotDescriptor(newslot, newTupDesc, false);
|
||||
|
||||
/* Preallocate values/nulls arrays (+1 in case natts==0) */
|
||||
/* Preallocate values/nulls arrays */
|
||||
i = Max(newTupDesc->natts, oldTupDesc->natts);
|
||||
values = (Datum *) palloc(i * sizeof(Datum) + 1);
|
||||
nulls = (char *) palloc(i * sizeof(char) + 1);
|
||||
values = (Datum *) palloc(i * sizeof(Datum));
|
||||
nulls = (char *) palloc(i * sizeof(char));
|
||||
memset(values, 0, i * sizeof(Datum));
|
||||
memset(nulls, 'n', i * sizeof(char));
|
||||
|
||||
@ -2363,24 +2363,14 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
|
||||
* Extract data from old tuple. We can force to null any
|
||||
* columns that are deleted according to the new tuple.
|
||||
*/
|
||||
int natts = oldTupDesc->natts;
|
||||
bool isNull;
|
||||
int natts = newTupDesc->natts;
|
||||
|
||||
heap_deformtuple(tuple, oldTupDesc, values, nulls);
|
||||
|
||||
for (i = 0; i < natts; i++)
|
||||
{
|
||||
if (newTupDesc->attrs[i]->attisdropped)
|
||||
nulls[i] = 'n';
|
||||
else
|
||||
{
|
||||
values[i] = heap_getattr(tuple,
|
||||
i + 1,
|
||||
oldTupDesc,
|
||||
&isNull);
|
||||
if (isNull)
|
||||
nulls[i] = 'n';
|
||||
else
|
||||
nulls[i] = ' ';
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2393,6 +2383,7 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
|
||||
foreach(l, tab->newvals)
|
||||
{
|
||||
NewColumnValue *ex = lfirst(l);
|
||||
bool isNull;
|
||||
|
||||
values[ex->attnum - 1] = ExecEvalExpr(ex->exprstate,
|
||||
econtext,
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.57 2004/05/26 04:41:12 neilc Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.58 2004/06/04 20:35:21 tgl Exp $
|
||||
*
|
||||
* DESCRIPTION
|
||||
* The "DefineFoo" routines take the parse tree and pick out the
|
||||
@ -1329,12 +1329,8 @@ AlterDomainNotNull(List *names, bool notNull)
|
||||
for (i = 0; i < rtc->natts; i++)
|
||||
{
|
||||
int attnum = rtc->atts[i];
|
||||
Datum d;
|
||||
bool isNull;
|
||||
|
||||
d = heap_getattr(tuple, attnum, tupdesc, &isNull);
|
||||
|
||||
if (isNull)
|
||||
if (heap_attisnull(tuple, attnum))
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_NOT_NULL_VIOLATION),
|
||||
errmsg("column \"%s\" of table \"%s\" contains null values",
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/executor/execJunk.c,v 1.40 2004/05/26 04:41:14 neilc Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/executor/execJunk.c,v 1.41 2004/06/04 20:35:21 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -246,12 +246,15 @@ ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot)
|
||||
TupleDesc cleanTupType;
|
||||
TupleDesc tupType;
|
||||
int cleanLength;
|
||||
bool isNull;
|
||||
int i;
|
||||
Datum *values;
|
||||
char *nulls;
|
||||
Datum *old_values;
|
||||
char *old_nulls;
|
||||
Datum values_array[64];
|
||||
Datum old_values_array[64];
|
||||
char nulls_array[64];
|
||||
char old_nulls_array[64];
|
||||
|
||||
/*
|
||||
* get info from the slot and the junk filter
|
||||
@ -265,11 +268,15 @@ ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot)
|
||||
|
||||
/*
|
||||
* Create the arrays that will hold the attribute values and the null
|
||||
* information for the new "clean" tuple.
|
||||
* information for the old tuple and new "clean" tuple.
|
||||
*
|
||||
* Note: we use memory on the stack to optimize things when we are
|
||||
* dealing with a small number of attributes. for large tuples we just
|
||||
* use palloc.
|
||||
*
|
||||
* Note: we could use just one set of arrays if we were willing to
|
||||
* assume that the resno mapping is monotonic... I think it is, but
|
||||
* won't take the risk of breaking things right now.
|
||||
*/
|
||||
if (cleanLength > 64)
|
||||
{
|
||||
@ -281,36 +288,52 @@ ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot)
|
||||
values = values_array;
|
||||
nulls = nulls_array;
|
||||
}
|
||||
if (tupType->natts > 64)
|
||||
{
|
||||
old_values = (Datum *) palloc(tupType->natts * sizeof(Datum));
|
||||
old_nulls = (char *) palloc(tupType->natts * sizeof(char));
|
||||
}
|
||||
else
|
||||
{
|
||||
old_values = old_values_array;
|
||||
old_nulls = old_nulls_array;
|
||||
}
|
||||
|
||||
/*
|
||||
* Exctract one by one all the values of the "clean" tuple.
|
||||
* Extract all the values of the old tuple.
|
||||
*/
|
||||
heap_deformtuple(tuple, tupType, old_values, old_nulls);
|
||||
|
||||
/*
|
||||
* Transpose into proper fields of the new tuple.
|
||||
*/
|
||||
for (i = 0; i < cleanLength; i++)
|
||||
{
|
||||
values[i] = heap_getattr(tuple, cleanMap[i], tupType, &isNull);
|
||||
int j = cleanMap[i] - 1;
|
||||
|
||||
if (isNull)
|
||||
nulls[i] = 'n';
|
||||
else
|
||||
nulls[i] = ' ';
|
||||
values[i] = old_values[j];
|
||||
nulls[i] = old_nulls[j];
|
||||
}
|
||||
|
||||
/*
|
||||
* Now form the new tuple.
|
||||
*/
|
||||
cleanTuple = heap_formtuple(cleanTupType,
|
||||
values,
|
||||
nulls);
|
||||
cleanTuple = heap_formtuple(cleanTupType, values, nulls);
|
||||
|
||||
/*
|
||||
* We are done. Free any space allocated for 'values' and 'nulls' and
|
||||
* return the new tuple.
|
||||
*/
|
||||
if (cleanLength > 64)
|
||||
if (values != values_array)
|
||||
{
|
||||
pfree(values);
|
||||
pfree(nulls);
|
||||
}
|
||||
if (old_values != old_values_array)
|
||||
{
|
||||
pfree(old_values);
|
||||
pfree(old_nulls);
|
||||
}
|
||||
|
||||
return cleanTuple;
|
||||
}
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.115 2004/05/30 23:40:26 neilc Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.116 2004/06/04 20:35:21 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -427,7 +427,6 @@ SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
|
||||
int numberOfAttributes;
|
||||
Datum *v;
|
||||
char *n;
|
||||
bool isnull;
|
||||
int i;
|
||||
|
||||
if (rel == NULL || tuple == NULL || natts < 0 || attnum == NULL || Values == NULL)
|
||||
@ -448,11 +447,7 @@ SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
|
||||
n = (char *) palloc(numberOfAttributes * sizeof(char));
|
||||
|
||||
/* fetch old values and nulls */
|
||||
for (i = 0; i < numberOfAttributes; i++)
|
||||
{
|
||||
v[i] = heap_getattr(tuple, i + 1, rel->rd_att, &isnull);
|
||||
n[i] = (isnull) ? 'n' : ' ';
|
||||
}
|
||||
heap_deformtuple(tuple, rel->rd_att, v, n);
|
||||
|
||||
/* replace values and nulls */
|
||||
for (i = 0; i < natts; i++)
|
||||
@ -474,7 +469,7 @@ SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
|
||||
mtuple->t_data->t_ctid = tuple->t_data->t_ctid;
|
||||
mtuple->t_self = tuple->t_self;
|
||||
mtuple->t_tableOid = tuple->t_tableOid;
|
||||
if (rel->rd_rel->relhasoids)
|
||||
if (rel->rd_att->tdhasoid)
|
||||
HeapTupleSetOid(mtuple, HeapTupleGetOid(tuple));
|
||||
}
|
||||
else
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.89 2004/04/21 18:24:26 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.90 2004/06/04 20:35:21 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -184,9 +184,9 @@ extern XLogRecPtr log_heap_move(Relation reln, Buffer oldbuf,
|
||||
Buffer newbuf, HeapTuple newtup);
|
||||
|
||||
/* in common/heaptuple.c */
|
||||
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *value, char *nulls);
|
||||
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *values, char *nulls);
|
||||
extern void DataFill(char *data, TupleDesc tupleDesc,
|
||||
Datum *value, char *nulls, uint16 *infomask,
|
||||
Datum *values, char *nulls, uint16 *infomask,
|
||||
bits8 *bit);
|
||||
extern int heap_attisnull(HeapTuple tup, int attnum);
|
||||
extern Datum nocachegetattr(HeapTuple tup, int attnum,
|
||||
@ -194,9 +194,14 @@ extern Datum nocachegetattr(HeapTuple tup, int attnum,
|
||||
extern HeapTuple heap_copytuple(HeapTuple tuple);
|
||||
extern void heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest);
|
||||
extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
|
||||
Datum *value, char *nulls);
|
||||
Datum *values, char *nulls);
|
||||
extern HeapTuple heap_modifytuple(HeapTuple tuple,
|
||||
Relation relation, Datum *replValue, char *replNull, char *repl);
|
||||
Relation relation,
|
||||
Datum *replValues,
|
||||
char *replNulls,
|
||||
char *replActions);
|
||||
extern void heap_deformtuple(HeapTuple tuple, TupleDesc tupleDesc,
|
||||
Datum *values, char *nulls);
|
||||
extern void heap_freetuple(HeapTuple tuple);
|
||||
extern HeapTuple heap_addheader(int natts, bool withoid, Size structlen, void *structure);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user