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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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3
contrib/pageinspect/brinfuncs.c
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@ -226,7 +226,8 @@ brin_page_items(PG_FUNCTION_ARGS)
if (ItemIdIsUsed(itemId))
{
dtup = brin_deform_tuple(bdesc,
(BrinTuple *) PageGetItem(page, itemId));
(BrinTuple *) PageGetItem(page, itemId),
NULL);
attno = 1;
unusedItem = false;
}