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Tweak querytree-dependency-extraction code so that columns of tables

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that are explicitly JOINed are not considered dependencies unless they
are actually used in the query: mere presence in the joinaliasvars
list of a JOIN RTE doesn't count as being used.  The patch touches
a number of files because I needed to generalize the API of
query_tree_walker to support an additional flag bit, but the changes
are otherwise quite small.
This commit is contained in:
Tom Lane
2002-09-11 14:48:55 +00:00
parent d634a5903f
commit 6fdc44be71
8 changed files with 89 additions and 55 deletions
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10
src/backend/optimizer/util/var.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.39 2002/09/04 20:31:22 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.40 2002/09/11 14:48:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -82,7 +82,7 @@ pull_varnos(Node *node)
*/
if (node && IsA(node, Query))
query_tree_walker((Query *) node, pull_varnos_walker,
(void *) &context, true);
(void *) &context, 0);
else
pull_varnos_walker(node, &context);
@ -128,7 +128,7 @@ pull_varnos_walker(Node *node, pull_varnos_context *context)
context->sublevels_up++;
result = query_tree_walker((Query *) node, pull_varnos_walker,
(void *) context, true);
(void *) context, 0);
context->sublevels_up--;
return result;
}
@ -165,7 +165,7 @@ contain_var_reference(Node *node, int varno, int varattno, int levelsup)
if (node && IsA(node, Query))
return query_tree_walker((Query *) node,
contain_var_reference_walker,
(void *) &context, true);
(void *) &context, 0);
else
return contain_var_reference_walker(node, &context);
}
@ -212,7 +212,7 @@ contain_var_reference_walker(Node *node,
context->sublevels_up++;
result = query_tree_walker((Query *) node,
contain_var_reference_walker,
(void *) context, true);
(void *) context, 0);
context->sublevels_up--;
return result;
}