Replace the switching function ExecEvalExpr() with a macro that jumps

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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.

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This commit is contained in:

Tom Lane

2004-03-17 01:02:24 +00:00

parent 2c7e473434

commit c1352052ef

7 changed files with 419 additions and 309 deletions

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654

src/backend/executor/execQual.c

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