diff options
Diffstat (limited to 'src/backend/optimizer/util/clauses.c')
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index ee037974769..f55c988bfc5 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -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); @@ -411,6 +412,32 @@ contain_agg_clause_walker(Node *node, void *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. * |