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Ensure that values stored within arrays are not toasted, per

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discussion on pghackers a few days ago.
This commit is contained in:
Tom Lane 2000-07-27 03:50:52 +00:00
parent 18f138263b
commit c7793a731c
1 changed files with 29 additions and 6 deletions
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35
src/backend/utils/adt/arrayfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.63 2000/07/23 01:35:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.64 2000/07/27 03:50:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -33,6 +33,12 @@
* <dim_lower> - lower boundary of each dimension
* <actual data> - whatever is the stored data
* The actual data starts on a MAXALIGN boundary.
*
* NOTE: it is important that array elements of toastable datatypes NOT be
* toasted, since the tupletoaster won't know they are there. (We could
* support compressed toasted items; only out-of-line items are dangerous.
* However, it seems preferable to store such items uncompressed and allow
* the toaster to compress the whole array as one input.)
*/
@ -459,6 +465,8 @@ ReadArrayStr(char *arrayStr,
{
if (values[i] != (Datum) 0)
{
/* let's just make sure data is not toasted */
values[i] = PointerGetDatum(PG_DETOAST_DATUM(values[i]));
if (typalign == 'd')
*nbytes += MAXALIGN(VARSIZE(DatumGetPointer(values[i])));
else
@ -485,6 +493,10 @@ ReadArrayStr(char *arrayStr,
* typbyval, typlen, typalign: info about element datatype
* freedata: if TRUE and element type is pass-by-ref, pfree data values
* referenced by Datums after copying them.
*
* If the input data is of varlena type, the caller must have ensured that
* the values are not toasted. (Doing it here doesn't work since the
* caller has already allocated space for the array...)
*----------
*/
static void
@ -961,6 +973,10 @@ array_set(ArrayType *array,
return newarray;
}
/* make sure item to be inserted is not toasted */
if (elmlen < 0)
dataValue = PointerGetDatum(PG_DETOAST_DATUM(dataValue));
/* detoast input if necessary */
array = DatumGetArrayTypeP(PointerGetDatum(array));
@ -1120,6 +1136,8 @@ array_set_slice(ArrayType *array,
array = DatumGetArrayTypeP(PointerGetDatum(array));
srcArray = DatumGetArrayTypeP(PointerGetDatum(srcArray));
/* note: we assume srcArray contains no toasted elements */
ndim = ARR_NDIM(array);
if (ndim != nSubscripts || ndim <= 0 || ndim > MAXDIM)
elog(ERROR, "Invalid array subscripts");
@ -1368,12 +1386,14 @@ array_map(FunctionCallInfo fcinfo, Oid inpType, Oid retType)
if (fcinfo->isnull)
elog(ERROR, "array_map: cannot handle NULL in array");
/* Update total result size */
if (typbyval)
/* Ensure data is not toasted, and update total result size */
if (typbyval || typlen > 0)
nbytes += typlen;
else
nbytes += ((typlen > 0) ? typlen :
INTALIGN(VARSIZE(DatumGetPointer(values[i]))));
{
values[i] = PointerGetDatum(PG_DETOAST_DATUM(values[i]));
nbytes += INTALIGN(VARSIZE(DatumGetPointer(values[i])));
}
}
/* Allocate and initialize the result array */
@ -1420,10 +1440,13 @@ construct_array(Datum *elems, int nelems,
}
else
{
/* varlena type */
/* varlena type ... make sure it is untoasted */
nbytes = 0;
for (i = 0; i < nelems; i++)
{
elems[i] = PointerGetDatum(PG_DETOAST_DATUM(elems[i]));
nbytes += INTALIGN(VARSIZE(DatumGetPointer(elems[i])));
}
}
/* Allocate and initialize 1-D result array */