database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-09-02 04:21:28 +03:00
Code Activity

Reimplement CASE val WHEN compval1 THEN ... WHEN compval2 THEN ... END

Browse Source 
so that the 'val' is computed only once, per recent discussion.  The
speedup is not much when 'val' is just a simple variable, but could be
significant for larger expressions.  More importantly this avoids issues
with multiple evaluations of a volatile 'val', and it allows the CASE
expression to be reverse-listed in its original form by ruleutils.c.
This commit is contained in:
Tom Lane
2004-03-17 20:48:43 +00:00
parent 8c702ea7ac
commit 55f7c3300d
16 changed files with 248 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/pl/plpgsql/src/pl_exec.c
View File

@@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.97 2004/02/25 18:10:51 tgl Exp $
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.98 2004/03/17 20:48:43 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@@ -3729,6 +3729,9 @@ exec_simple_check_node(Node *node)
return TRUE;
}
case T_CaseTestExpr:
return TRUE;
case T_ArrayExpr:
{
ArrayExpr *expr = (ArrayExpr *) node;
@@ -3770,6 +3773,9 @@ exec_simple_check_node(Node *node)
case T_CoerceToDomain:
return exec_simple_check_node((Node *) ((CoerceToDomain *) node)->arg);
case T_CoerceToDomainValue:
return TRUE;
case T_List:
{
List *expr = (List *) node;