CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl(at)developer(dot)postgresql(dot)org 03/05/30 16:23:10
Modified files:
src/backend/executor: nodeAgg.c nodeHashjoin.c
Log message:
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.