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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2003-05-30 20:23:10 +0000 |
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| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2003-05-30 20:23:10 +0000 |
| commit | d24d75ff194e292fe49c6c84d0124cc61b182d3c (patch) | |
| tree | c302d2f87a1ddd74ceddef180bee54d7715424f3 /src/backend/executor/execMain.c | |
| parent | 776d5309240bdadc5f905cacba5f237e532c6139 (diff) | |
| download | postgresql-d24d75ff194e292fe49c6c84d0124cc61b182d3c.tar.gz postgresql-d24d75ff194e292fe49c6c84d0124cc61b182d3c.zip | |
Small performance improvement for hash joins and hash aggregation:
when the plan is ReScanned, we don't have to rebuild the hash table
if there is no parameter change for its child node. This idea has
been used for a long time in Sort and Material nodes, but was not in
the hash code till now.
Diffstat (limited to 'src/backend/executor/execMain.c')
0 files changed, 0 insertions, 0 deletions