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Diffstat (limited to 'src/backend/rewrite/rewriteManip.c')
-rw-r--r--src/backend/rewrite/rewriteManip.c139
1 files changed, 43 insertions, 96 deletions
diff --git a/src/backend/rewrite/rewriteManip.c b/src/backend/rewrite/rewriteManip.c
index 22e7eee306c..4a4f6824b78 100644
--- a/src/backend/rewrite/rewriteManip.c
+++ b/src/backend/rewrite/rewriteManip.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.68 2002/12/12 15:49:40 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.69 2003/01/17 02:01:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -22,15 +22,6 @@
#include "utils/lsyscache.h"
-/* macros borrowed from expression_tree_mutator */
-
-#define FLATCOPY(newnode, node, nodetype) \
- ( (newnode) = makeNode(nodetype), \
- memcpy((newnode), (node), sizeof(nodetype)) )
-
-#define MUTATE(newfield, oldfield, fieldtype, mutator, context) \
- ( (newfield) = (fieldtype) mutator((Node *) (oldfield), (context)) )
-
static bool checkExprHasAggs_walker(Node *node, void *context);
static bool checkExprHasSubLink_walker(Node *node, void *context);
@@ -47,11 +38,10 @@ checkExprHasAggs(Node *node)
* If a Query is passed, examine it --- but we will not recurse into
* sub-Queries.
*/
- if (node && IsA(node, Query))
- return query_tree_walker((Query *) node, checkExprHasAggs_walker,
- NULL, QTW_IGNORE_SUBQUERIES);
- else
- return checkExprHasAggs_walker(node, NULL);
+ return query_or_expression_tree_walker(node,
+ checkExprHasAggs_walker,
+ NULL,
+ QTW_IGNORE_RT_SUBQUERIES);
}
static bool
@@ -77,11 +67,10 @@ checkExprHasSubLink(Node *node)
* If a Query is passed, examine it --- but we will not recurse into
* sub-Queries.
*/
- if (node && IsA(node, Query))
- return query_tree_walker((Query *) node, checkExprHasSubLink_walker,
- NULL, QTW_IGNORE_SUBQUERIES);
- else
- return checkExprHasSubLink_walker(node, NULL);
+ return query_or_expression_tree_walker(node,
+ checkExprHasSubLink_walker,
+ NULL,
+ QTW_IGNORE_RT_SUBQUERIES);
}
static bool
@@ -380,14 +369,12 @@ IncrementVarSublevelsUp(Node *node, int delta_sublevels_up,
/*
* Must be prepared to start with a Query or a bare expression tree;
- * if it's a Query, go straight to query_tree_walker to make sure that
- * sublevels_up doesn't get incremented prematurely.
+ * if it's a Query, we don't want to increment sublevels_up.
*/
- if (node && IsA(node, Query))
- query_tree_walker((Query *) node, IncrementVarSublevelsUp_walker,
- (void *) &context, 0);
- else
- IncrementVarSublevelsUp_walker(node, &context);
+ query_or_expression_tree_walker(node,
+ IncrementVarSublevelsUp_walker,
+ (void *) &context,
+ 0);
}
@@ -461,14 +448,12 @@ rangeTableEntry_used(Node *node, int rt_index, int sublevels_up)
/*
* Must be prepared to start with a Query or a bare expression tree;
- * if it's a Query, go straight to query_tree_walker to make sure that
- * sublevels_up doesn't get incremented prematurely.
+ * if it's a Query, we don't want to increment sublevels_up.
*/
- if (node && IsA(node, Query))
- return query_tree_walker((Query *) node, rangeTableEntry_used_walker,
- (void *) &context, 0);
- else
- return rangeTableEntry_used_walker(node, &context);
+ return query_or_expression_tree_walker(node,
+ rangeTableEntry_used_walker,
+ (void *) &context,
+ 0);
}
@@ -527,14 +512,12 @@ attribute_used(Node *node, int rt_index, int attno, int sublevels_up)
/*
* Must be prepared to start with a Query or a bare expression tree;
- * if it's a Query, go straight to query_tree_walker to make sure that
- * sublevels_up doesn't get incremented prematurely.
+ * if it's a Query, we don't want to increment sublevels_up.
*/
- if (node && IsA(node, Query))
- return query_tree_walker((Query *) node, attribute_used_walker,
- (void *) &context, 0);
- else
- return attribute_used_walker(node, &context);
+ return query_or_expression_tree_walker(node,
+ attribute_used_walker,
+ (void *) &context,
+ 0);
}
@@ -820,30 +803,16 @@ ResolveNew_mutator(Node *node, ResolveNew_context *context)
/* otherwise fall through to copy the var normally */
}
- /*
- * Since expression_tree_mutator won't touch subselects, we have to
- * handle them specially.
- */
- if (IsA(node, SubLink))
- {
- SubLink *sublink = (SubLink *) node;
- SubLink *newnode;
-
- FLATCOPY(newnode, sublink, SubLink);
- MUTATE(newnode->lefthand, sublink->lefthand, List *,
- ResolveNew_mutator, context);
- MUTATE(newnode->subselect, sublink->subselect, Node *,
- ResolveNew_mutator, context);
- return (Node *) newnode;
- }
if (IsA(node, Query))
{
- Query *query = (Query *) node;
+ /* Recurse into RTE subquery or not-yet-planned sublink subquery */
Query *newnode;
- FLATCOPY(newnode, query, Query);
context->sublevels_up++;
- query_tree_mutator(newnode, ResolveNew_mutator, context, 0);
+ newnode = query_tree_mutator((Query *) node,
+ ResolveNew_mutator,
+ (void *) context,
+ 0);
context->sublevels_up--;
return (Node *) newnode;
}
@@ -865,21 +834,12 @@ ResolveNew(Node *node, int target_varno, int sublevels_up,
/*
* Must be prepared to start with a Query or a bare expression tree;
- * if it's a Query, go straight to query_tree_mutator to make sure
- * that sublevels_up doesn't get incremented prematurely.
+ * if it's a Query, we don't want to increment sublevels_up.
*/
- if (node && IsA(node, Query))
- {
- Query *query = (Query *) node;
- Query *newnode;
-
- FLATCOPY(newnode, query, Query);
- query_tree_mutator(newnode, ResolveNew_mutator,
- (void *) &context, 0);
- return (Node *) newnode;
- }
- else
- return ResolveNew_mutator(node, &context);
+ return query_or_expression_tree_mutator(node,
+ ResolveNew_mutator,
+ (void *) &context,
+ 0);
}
@@ -959,31 +919,16 @@ HandleRIRAttributeRule_mutator(Node *node,
/* otherwise fall through to copy the var normally */
}
- /*
- * Since expression_tree_mutator won't touch subselects, we have to
- * handle them specially.
- */
- if (IsA(node, SubLink))
- {
- SubLink *sublink = (SubLink *) node;
- SubLink *newnode;
-
- FLATCOPY(newnode, sublink, SubLink);
- MUTATE(newnode->lefthand, sublink->lefthand, List *,
- HandleRIRAttributeRule_mutator, context);
- MUTATE(newnode->subselect, sublink->subselect, Node *,
- HandleRIRAttributeRule_mutator, context);
- return (Node *) newnode;
- }
if (IsA(node, Query))
{
- Query *query = (Query *) node;
+ /* Recurse into RTE subquery or not-yet-planned sublink subquery */
Query *newnode;
- FLATCOPY(newnode, query, Query);
context->sublevels_up++;
- query_tree_mutator(newnode, HandleRIRAttributeRule_mutator,
- context, 0);
+ newnode = query_tree_mutator((Query *) node,
+ HandleRIRAttributeRule_mutator,
+ (void *) context,
+ 0);
context->sublevels_up--;
return (Node *) newnode;
}
@@ -1010,8 +955,10 @@ HandleRIRAttributeRule(Query *parsetree,
context.badsql = badsql;
context.sublevels_up = 0;
- query_tree_mutator(parsetree, HandleRIRAttributeRule_mutator,
- (void *) &context, 0);
+ query_tree_mutator(parsetree,
+ HandleRIRAttributeRule_mutator,
+ (void *) &context,
+ QTW_DONT_COPY_QUERY);
}
#endif /* NOT_USED */
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-02 20:24:57 +0000