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Reduce the number of pallocs() in BRIN

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Instead of allocating memory in brin_deform_tuple and brin_copy_tuple
over and over during a scan, allow reuse of previously allocated memory.
This is said to make for a measurable performance improvement.

Author: Jinyu Zhang, Álvaro Herrera
Reviewed by: Tomas Vondra
Discussion: https://postgr.es/m/495deb78.4186.1500dacaa63.Coremail.beijing_pg@163.com
This commit is contained in:
Alvaro Herrera
2017-04-07 18:54:26 -03:00
parent e8fdbd58fe
commit 8bf74967da
5 changed files with 78 additions and 42 deletions
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12
src/include/access/brin_tuple.h
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@@ -38,6 +38,11 @@ typedef struct BrinMemTuple
bool bt_placeholder; /* this is a placeholder tuple */
BlockNumber bt_blkno; /* heap blkno that the tuple is for */
MemoryContext bt_context; /* memcxt holding the bt_columns values */
/* output arrays for brin_deform_tuple: */
Datum *bt_values; /* values array */
bool *bt_allnulls; /* allnulls array */
bool *bt_hasnulls; /* hasnulls array */
/* not an output array, but must be last */
BrinValues bt_columns[FLEXIBLE_ARRAY_MEMBER];
} BrinMemTuple;
@@ -83,14 +88,15 @@ extern BrinTuple *brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno,
extern BrinTuple *brin_form_placeholder_tuple(BrinDesc *brdesc,
BlockNumber blkno, Size *size);
extern void brin_free_tuple(BrinTuple *tuple);
extern BrinTuple *brin_copy_tuple(BrinTuple *tuple, Size len);
extern BrinTuple *brin_copy_tuple(BrinTuple *tuple, Size len,
BrinTuple *dest, Size *destsz);
extern bool brin_tuples_equal(const BrinTuple *a, Size alen,
const BrinTuple *b, Size blen);
extern BrinMemTuple *brin_new_memtuple(BrinDesc *brdesc);
extern void brin_memtuple_initialize(BrinMemTuple *dtuple,
extern BrinMemTuple *brin_memtuple_initialize(BrinMemTuple *dtuple,
BrinDesc *brdesc);
extern BrinMemTuple *brin_deform_tuple(BrinDesc *brdesc,
BrinTuple *tuple);
BrinTuple *tuple, BrinMemTuple *dMemtuple);
#endif /* BRIN_TUPLE_H */