pgsql-server/src backend/executor/execQual.c b ...

CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl(at)svr1(dot)postgresql(dot)org 04/03/16 21:02:24

Modified files:
src/backend/executor: execQual.c nodeHash.c nodeMergejoin.c
nodeSubplan.c
src/include/executor: executor.h nodeSubplan.h
src/include/nodes: execnodes.h

Log message:
Replace the switching function ExecEvalExpr() with a macro that jumps
directly to the appropriate per-node execution function, using a function
pointer stored by ExecInitExpr. This speeds things up by eliminating one
level of function call. The function-pointer technique also enables further
small improvements such as only making one-time tests once (and then
changing the function pointer). Overall this seems to gain about 10%
on evaluation of simple expressions, which isn't earthshaking but seems
a worthwhile gain for a relatively small hack. Per recent discussion
on pghackers.