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Commit37e0a01

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Save a few cycles in plpgsql simple-expression initialization.
Instead of using ExecPrepareExpr, call ExecInitExpr. The net change hereis that we don't apply expression_planner() to the expression tree. Thereis no need to do so, because that tree is extracted from a fully plannedplancache entry, so all the needed work is already done. This reducesthe setup costs by about a factor of 2 according to some simple tests.Oversight noted while fooling around with the simple-expression code forprevious fix.
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‎src/pl/plpgsql/src/pl_exec.c

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -4577,10 +4577,11 @@ exec_eval_simple_expr(PLpgSQL_execstate *estate,
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*/
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if (expr->expr_simple_lxid!=curlxid)
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{
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expr->expr_simple_state=ExecPrepareExpr(expr->expr_simple_expr,
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simple_eval_estate);
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oldcontext=MemoryContextSwitchTo(simple_eval_estate->es_query_cxt);
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expr->expr_simple_state=ExecInitExpr(expr->expr_simple_expr,NULL);
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expr->expr_simple_in_use= false;
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expr->expr_simple_lxid=curlxid;
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MemoryContextSwitchTo(oldcontext);
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}
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/*

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