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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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34
src/backend/rewrite/rewriteManip.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.65 2002/09/04 20:31:25 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.66 2002/09/11 14:48:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -49,7 +49,7 @@ checkExprHasAggs(Node *node)
*/
if (node && IsA(node, Query))
return query_tree_walker((Query *) node, checkExprHasAggs_walker,
NULL, false);
NULL, QTW_IGNORE_SUBQUERIES);
else
return checkExprHasAggs_walker(node, NULL);
}
@ -79,7 +79,7 @@ checkExprHasSubLink(Node *node)
*/
if (node && IsA(node, Query))
return query_tree_walker((Query *) node, checkExprHasSubLink_walker,
NULL, false);
NULL, QTW_IGNORE_SUBQUERIES);
else
return checkExprHasSubLink_walker(node, NULL);
}
@ -155,7 +155,7 @@ OffsetVarNodes_walker(Node *node, OffsetVarNodes_context *context)
context->sublevels_up++;
result = query_tree_walker((Query *) node, OffsetVarNodes_walker,
(void *) context, true);
(void *) context, 0);
context->sublevels_up--;
return result;
}
@ -196,7 +196,7 @@ OffsetVarNodes(Node *node, int offset, int sublevels_up)
lfirsti(l) += offset;
}
query_tree_walker(qry, OffsetVarNodes_walker,
(void *) &context, true);
(void *) &context, 0);
}
else
OffsetVarNodes_walker(node, &context);
@ -265,7 +265,7 @@ ChangeVarNodes_walker(Node *node, ChangeVarNodes_context *context)
context->sublevels_up++;
result = query_tree_walker((Query *) node, ChangeVarNodes_walker,
(void *) context, true);
(void *) context, 0);
context->sublevels_up--;
return result;
}
@ -310,7 +310,7 @@ ChangeVarNodes(Node *node, int rt_index, int new_index, int sublevels_up)
}
}
query_tree_walker(qry, ChangeVarNodes_walker,
(void *) &context, true);
(void *) &context, 0);
}
else
ChangeVarNodes_walker(node, &context);
@ -361,7 +361,7 @@ IncrementVarSublevelsUp_walker(Node *node,
context->min_sublevels_up++;
result = query_tree_walker((Query *) node,
IncrementVarSublevelsUp_walker,
(void *) context, true);
(void *) context, 0);
context->min_sublevels_up--;
return result;
}
@ -385,7 +385,7 @@ IncrementVarSublevelsUp(Node *node, int delta_sublevels_up,
*/
if (node && IsA(node, Query))
query_tree_walker((Query *) node, IncrementVarSublevelsUp_walker,
(void *) &context, true);
(void *) &context, 0);
else
IncrementVarSublevelsUp_walker(node, &context);
}
@ -443,7 +443,7 @@ rangeTableEntry_used_walker(Node *node,
context->sublevels_up++;
result = query_tree_walker((Query *) node, rangeTableEntry_used_walker,
(void *) context, true);
(void *) context, 0);
context->sublevels_up--;
return result;
}
@ -466,7 +466,7 @@ rangeTableEntry_used(Node *node, int rt_index, int sublevels_up)
*/
if (node && IsA(node, Query))
return query_tree_walker((Query *) node, rangeTableEntry_used_walker,
(void *) &context, true);
(void *) &context, 0);
else
return rangeTableEntry_used_walker(node, &context);
}
@ -508,7 +508,7 @@ attribute_used_walker(Node *node,
context->sublevels_up++;
result = query_tree_walker((Query *) node, attribute_used_walker,
(void *) context, true);
(void *) context, 0);
context->sublevels_up--;
return result;
}
@ -532,7 +532,7 @@ attribute_used(Node *node, int rt_index, int attno, int sublevels_up)
*/
if (node && IsA(node, Query))
return query_tree_walker((Query *) node, attribute_used_walker,
(void *) &context, true);
(void *) &context, 0);
else
return attribute_used_walker(node, &context);
}
@ -851,7 +851,7 @@ ResolveNew_mutator(Node *node, ResolveNew_context *context)
FLATCOPY(newnode, query, Query);
context->sublevels_up++;
query_tree_mutator(newnode, ResolveNew_mutator, context, true);
query_tree_mutator(newnode, ResolveNew_mutator, context, 0);
context->sublevels_up--;
return (Node *) newnode;
}
@ -883,7 +883,7 @@ ResolveNew(Node *node, int target_varno, int sublevels_up,
FLATCOPY(newnode, query, Query);
query_tree_mutator(newnode, ResolveNew_mutator,
(void *) &context, true);
(void *) &context, 0);
return (Node *) newnode;
}
else
@ -991,7 +991,7 @@ HandleRIRAttributeRule_mutator(Node *node,
FLATCOPY(newnode, query, Query);
context->sublevels_up++;
query_tree_mutator(newnode, HandleRIRAttributeRule_mutator,
context, true);
context, 0);
context->sublevels_up--;
return (Node *) newnode;
}
@ -1019,7 +1019,7 @@ HandleRIRAttributeRule(Query *parsetree,
context.sublevels_up = 0;
query_tree_mutator(parsetree, HandleRIRAttributeRule_mutator,
(void *) &context, true);
(void *) &context, 0);
}
#endif /* NOT_USED */