mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-09 08:10:09 +08:00
370 lines
8.3 KiB
C
370 lines
8.3 KiB
C
/*
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* contrib/btree_gist/btree_utils_num.c
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*/
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#include "postgres.h"
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#include "btree_gist.h"
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#include "btree_utils_num.h"
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#include "utils/cash.h"
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#include "utils/date.h"
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#include "utils/timestamp.h"
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GISTENTRY *
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gbt_num_compress(GISTENTRY *entry, const gbtree_ninfo *tinfo)
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{
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GISTENTRY *retval;
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if (entry->leafkey)
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{
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union
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{
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int16 i2;
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int32 i4;
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int64 i8;
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float4 f4;
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float8 f8;
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DateADT dt;
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TimeADT tm;
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Timestamp ts;
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Cash ch;
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} v;
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GBT_NUMKEY *r = (GBT_NUMKEY *) palloc0(tinfo->indexsize);
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void *leaf = NULL;
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switch (tinfo->t)
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{
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case gbt_t_int2:
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v.i2 = DatumGetInt16(entry->key);
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leaf = &v.i2;
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break;
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case gbt_t_int4:
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v.i4 = DatumGetInt32(entry->key);
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leaf = &v.i4;
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break;
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case gbt_t_int8:
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v.i8 = DatumGetInt64(entry->key);
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leaf = &v.i8;
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break;
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case gbt_t_oid:
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v.i4 = DatumGetObjectId(entry->key);
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leaf = &v.i4;
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break;
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case gbt_t_float4:
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v.f4 = DatumGetFloat4(entry->key);
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leaf = &v.f4;
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break;
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case gbt_t_float8:
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v.f8 = DatumGetFloat8(entry->key);
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leaf = &v.f8;
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break;
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case gbt_t_date:
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v.dt = DatumGetDateADT(entry->key);
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leaf = &v.dt;
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break;
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case gbt_t_time:
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v.tm = DatumGetTimeADT(entry->key);
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leaf = &v.tm;
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break;
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case gbt_t_ts:
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v.ts = DatumGetTimestamp(entry->key);
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leaf = &v.ts;
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break;
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case gbt_t_cash:
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v.ch = DatumGetCash(entry->key);
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leaf = &v.ch;
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break;
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default:
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leaf = DatumGetPointer(entry->key);
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}
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Assert(tinfo->indexsize >= 2 * tinfo->size);
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memcpy((void *) &r[0], leaf, tinfo->size);
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memcpy((void *) &r[tinfo->size], leaf, tinfo->size);
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retval = palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(r), entry->rel, entry->page,
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entry->offset, FALSE);
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}
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else
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retval = entry;
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return retval;
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}
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/*
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* Convert a compressed leaf item back to the original type, for index-only
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* scans.
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*/
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GISTENTRY *
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gbt_num_fetch(GISTENTRY *entry, const gbtree_ninfo *tinfo)
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{
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GISTENTRY *retval;
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Datum datum;
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Assert(tinfo->indexsize >= 2 * tinfo->size);
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/*
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* Get the original Datum from the stored datum. On leaf entries, the
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* lower and upper bound are the same. We just grab the lower bound and
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* return it.
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*/
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switch (tinfo->t)
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{
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case gbt_t_int2:
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datum = Int16GetDatum(*(int16 *) entry->key);
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break;
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case gbt_t_int4:
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datum = Int32GetDatum(*(int32 *) entry->key);
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break;
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case gbt_t_int8:
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datum = Int64GetDatum(*(int64 *) entry->key);
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break;
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case gbt_t_oid:
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datum = ObjectIdGetDatum(*(Oid *) entry->key);
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break;
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case gbt_t_float4:
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datum = Float4GetDatum(*(float4 *) entry->key);
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break;
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case gbt_t_float8:
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datum = Float8GetDatum(*(float8 *) entry->key);
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break;
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case gbt_t_date:
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datum = DateADTGetDatum(*(DateADT *) entry->key);
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break;
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case gbt_t_time:
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datum = TimeADTGetDatum(*(TimeADT *) entry->key);
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break;
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case gbt_t_ts:
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datum = TimestampGetDatum(*(Timestamp *) entry->key);
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break;
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case gbt_t_cash:
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datum = CashGetDatum(*(Cash *) entry->key);
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break;
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default:
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datum = PointerGetDatum(entry->key);
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}
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retval = palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, datum, entry->rel, entry->page, entry->offset,
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FALSE);
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return retval;
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}
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/*
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** The GiST union method for numerical values
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*/
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void *
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gbt_num_union(GBT_NUMKEY *out, const GistEntryVector *entryvec, const gbtree_ninfo *tinfo)
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{
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int i,
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numranges;
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GBT_NUMKEY *cur;
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GBT_NUMKEY_R o,
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c;
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numranges = entryvec->n;
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cur = (GBT_NUMKEY *) DatumGetPointer((entryvec->vector[0].key));
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o.lower = &((GBT_NUMKEY *) out)[0];
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o.upper = &((GBT_NUMKEY *) out)[tinfo->size];
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memcpy((void *) out, (void *) cur, 2 * tinfo->size);
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for (i = 1; i < numranges; i++)
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{
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cur = (GBT_NUMKEY *) DatumGetPointer((entryvec->vector[i].key));
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c.lower = &cur[0];
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c.upper = &cur[tinfo->size];
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if ((*tinfo->f_gt) (o.lower, c.lower)) /* out->lower > cur->lower */
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memcpy((void *) o.lower, (void *) c.lower, tinfo->size);
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if ((*tinfo->f_lt) (o.upper, c.upper)) /* out->upper < cur->upper */
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memcpy((void *) o.upper, (void *) c.upper, tinfo->size);
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}
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return out;
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}
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/*
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** The GiST same method for numerical values
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*/
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bool
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gbt_num_same(const GBT_NUMKEY *a, const GBT_NUMKEY *b, const gbtree_ninfo *tinfo)
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{
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GBT_NUMKEY_R b1,
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b2;
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b1.lower = &(((GBT_NUMKEY *) a)[0]);
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b1.upper = &(((GBT_NUMKEY *) a)[tinfo->size]);
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b2.lower = &(((GBT_NUMKEY *) b)[0]);
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b2.upper = &(((GBT_NUMKEY *) b)[tinfo->size]);
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return ((*tinfo->f_eq) (b1.lower, b2.lower) &&
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(*tinfo->f_eq) (b1.upper, b2.upper));
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}
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void
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gbt_num_bin_union(Datum *u, GBT_NUMKEY *e, const gbtree_ninfo *tinfo)
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{
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GBT_NUMKEY_R rd;
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rd.lower = &e[0];
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rd.upper = &e[tinfo->size];
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if (!DatumGetPointer(*u))
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{
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*u = PointerGetDatum(palloc0(tinfo->indexsize));
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memcpy((void *) &(((GBT_NUMKEY *) DatumGetPointer(*u))[0]), (void *) rd.lower, tinfo->size);
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memcpy((void *) &(((GBT_NUMKEY *) DatumGetPointer(*u))[tinfo->size]), (void *) rd.upper, tinfo->size);
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}
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else
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{
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GBT_NUMKEY_R ur;
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ur.lower = &(((GBT_NUMKEY *) DatumGetPointer(*u))[0]);
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ur.upper = &(((GBT_NUMKEY *) DatumGetPointer(*u))[tinfo->size]);
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if ((*tinfo->f_gt) ((void *) ur.lower, (void *) rd.lower))
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memcpy((void *) ur.lower, (void *) rd.lower, tinfo->size);
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if ((*tinfo->f_lt) ((void *) ur.upper, (void *) rd.upper))
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memcpy((void *) ur.upper, (void *) rd.upper, tinfo->size);
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}
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}
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/*
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* The GiST consistent method
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*
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* Note: we currently assume that no datatypes that use this routine are
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* collation-aware; so we don't bother passing collation through.
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*/
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bool
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gbt_num_consistent(const GBT_NUMKEY_R *key,
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const void *query,
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const StrategyNumber *strategy,
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bool is_leaf,
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const gbtree_ninfo *tinfo)
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{
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bool retval;
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switch (*strategy)
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{
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case BTLessEqualStrategyNumber:
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retval = (*tinfo->f_ge) (query, key->lower);
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break;
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case BTLessStrategyNumber:
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if (is_leaf)
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retval = (*tinfo->f_gt) (query, key->lower);
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else
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retval = (*tinfo->f_ge) (query, key->lower);
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break;
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case BTEqualStrategyNumber:
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if (is_leaf)
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retval = (*tinfo->f_eq) (query, key->lower);
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else
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retval = ((*tinfo->f_le) (key->lower, query) && (*tinfo->f_le) (query, key->upper)) ? true : false;
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break;
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case BTGreaterStrategyNumber:
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if (is_leaf)
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retval = (*tinfo->f_lt) (query, key->upper);
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else
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retval = (*tinfo->f_le) (query, key->upper);
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break;
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case BTGreaterEqualStrategyNumber:
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retval = (*tinfo->f_le) (query, key->upper);
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break;
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case BtreeGistNotEqualStrategyNumber:
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retval = (!((*tinfo->f_eq) (query, key->lower) &&
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(*tinfo->f_eq) (query, key->upper))) ? true : false;
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break;
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default:
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retval = false;
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}
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return (retval);
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}
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/*
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** The GiST distance method (for KNN-Gist)
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*/
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float8
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gbt_num_distance(const GBT_NUMKEY_R *key,
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const void *query,
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bool is_leaf,
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const gbtree_ninfo *tinfo)
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{
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float8 retval;
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if (tinfo->f_dist == NULL)
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elog(ERROR, "KNN search is not supported for btree_gist type %d",
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(int) tinfo->t);
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if (tinfo->f_le(query, key->lower))
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retval = tinfo->f_dist(query, key->lower);
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else if (tinfo->f_ge(query, key->upper))
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retval = tinfo->f_dist(query, key->upper);
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else
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retval = 0.0;
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return retval;
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}
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GIST_SPLITVEC *
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gbt_num_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v,
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const gbtree_ninfo *tinfo)
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{
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OffsetNumber i,
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maxoff = entryvec->n - 1;
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Nsrt *arr;
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int nbytes;
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arr = (Nsrt *) palloc((maxoff + 1) * sizeof(Nsrt));
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nbytes = (maxoff + 2) * sizeof(OffsetNumber);
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v->spl_left = (OffsetNumber *) palloc(nbytes);
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v->spl_right = (OffsetNumber *) palloc(nbytes);
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v->spl_ldatum = PointerGetDatum(0);
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v->spl_rdatum = PointerGetDatum(0);
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v->spl_nleft = 0;
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v->spl_nright = 0;
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/* Sort entries */
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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arr[i].t = (GBT_NUMKEY *) DatumGetPointer((entryvec->vector[i].key));
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arr[i].i = i;
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}
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qsort((void *) &arr[FirstOffsetNumber], maxoff - FirstOffsetNumber + 1, sizeof(Nsrt), tinfo->f_cmp);
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/* We do simply create two parts */
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
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{
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gbt_num_bin_union(&v->spl_ldatum, arr[i].t, tinfo);
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v->spl_left[v->spl_nleft] = arr[i].i;
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v->spl_nleft++;
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}
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else
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{
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gbt_num_bin_union(&v->spl_rdatum, arr[i].t, tinfo);
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v->spl_right[v->spl_nright] = arr[i].i;
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v->spl_nright++;
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}
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}
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return v;
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}
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