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Phase 2 of hashed-aggregation project. nodeAgg.c now knows how to do

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hashed aggregation, but there's not yet planner support for it.
This commit is contained in:
Tom Lane
2002-11-06 22:31:24 +00:00
parent fc9814d17e
commit 2103b7baa2
12 changed files with 696 additions and 266 deletions
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29
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.109 2002/09/11 14:48:54 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.110 2002/11/06 22:31:24 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -46,6 +46,7 @@ typedef struct
} check_subplans_for_ungrouped_vars_context;
static bool contain_agg_clause_walker(Node *node, void *context);
static bool contain_distinct_agg_clause_walker(Node *node, void *context);
static bool pull_agg_clause_walker(Node *node, List **listptr);
static bool expression_returns_set_walker(Node *node, void *context);
static bool contain_subplans_walker(Node *node, void *context);
@@ -410,6 +411,32 @@ contain_agg_clause_walker(Node *node, void *context)
return expression_tree_walker(node, contain_agg_clause_walker, context);
}
/*
* contain_distinct_agg_clause
* Recursively search for DISTINCT Aggref nodes within a clause.
*
* Returns true if any DISTINCT aggregate found.
*/
bool
contain_distinct_agg_clause(Node *clause)
{
return contain_distinct_agg_clause_walker(clause, NULL);
}
static bool
contain_distinct_agg_clause_walker(Node *node, void *context)
{
if (node == NULL)
return false;
if (IsA(node, Aggref))
{
if (((Aggref *) node)->aggdistinct)
return true; /* abort the tree traversal and return
* true */
}
return expression_tree_walker(node, contain_distinct_agg_clause_walker, context);
}
/*
* pull_agg_clause
* Recursively pulls all Aggref nodes from an expression tree.