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Add index-only scan support to btree_gist.

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inet, cidr, and timetz indexes still cannot support index-only scans,
because they don't store the original unmodified value in the index, but a
derived approximate value.
This commit is contained in:
Heikki Linnakangas
2015-03-27 23:35:16 +02:00
parent 735cd6128a
commit e09b48316c
46 changed files with 614 additions and 51 deletions
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58
contrib/btree_gist/btree_utils_num.c
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@ -93,6 +93,64 @@ gbt_num_compress(GISTENTRY *entry, const gbtree_ninfo *tinfo)
return retval;
}
/*
* Convert a compressed leaf item back to the original type, for index-only
* scans.
*/
GISTENTRY *
gbt_num_fetch(GISTENTRY *entry, const gbtree_ninfo *tinfo)
{
GISTENTRY *retval;
Datum datum;
Assert(tinfo->indexsize >= 2 * tinfo->size);
/*
* Get the original Datum from the stored datum. On leaf entries, the
* lower and upper bound are the same. We just grab the lower bound and
* return it.
*/
switch (tinfo->t)
{
case gbt_t_int2:
datum = Int16GetDatum(*(int16 *) entry->key);
break;
case gbt_t_int4:
datum = Int32GetDatum(*(int32 *) entry->key);
break;
case gbt_t_int8:
datum = Int64GetDatum(*(int64 *) entry->key);
break;
case gbt_t_oid:
datum = ObjectIdGetDatum(*(Oid *) entry->key);
break;
case gbt_t_float4:
datum = Float4GetDatum(*(float4 *) entry->key);
break;
case gbt_t_float8:
datum = Float8GetDatum(*(float8 *) entry->key);
break;
case gbt_t_date:
datum = DateADTGetDatum(*(DateADT *) entry->key);
break;
case gbt_t_time:
datum = TimeADTGetDatum(*(TimeADT *) entry->key);
break;
case gbt_t_ts:
datum = TimestampGetDatum(*(Timestamp *) entry->key);
break;
case gbt_t_cash:
datum = CashGetDatum(*(Cash *) entry->key);
break;
default:
datum = PointerGetDatum(entry->key);
}
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, datum, entry->rel, entry->page, entry->offset,
FALSE);
return retval;
}