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Fix parse_agg.c to detect ungrouped Vars in sub-SELECTs; remove code
that used to do it in planner. That was an ancient kluge that was never satisfactory; errors should be detected at parse time when possible. But at the time we didn't have the support mechanism (expression_tree_walker et al) to make it convenient to do in the parser.
This commit is contained in:
Tom Lane
parent
a4d82dd4b4
commit
b19adc1aae
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.139 2003/01/15 19:35:40 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.140 2003/01/17 03:25:03 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -208,17 +208,6 @@ subquery_planner(Query *parse, double tuple_fraction)
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/* These are not targetlist items, but close enough... */
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}
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/*
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* Check for ungrouped variables passed to subplans in targetlist and
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* HAVING clause (but not in WHERE or JOIN/ON clauses, since those are
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* evaluated before grouping). We can't do this any earlier because
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* we must use the preprocessed targetlist for comparisons of grouped
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* expressions.
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*/
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if (parse->hasSubLinks &&
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(parse->groupClause != NIL || parse->hasAggs))
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check_subplans_for_ungrouped_vars(parse);
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/*
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* A HAVING clause without aggregates is equivalent to a WHERE clause
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* (except it can only refer to grouped fields). Transfer any
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.123 2003/01/17 02:01:16 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.124 2003/01/17 03:25:03 tgl Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -20,7 +20,6 @@
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#include "postgres.h"
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#include "catalog/pg_language.h"
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#include "catalog/pg_operator.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_type.h"
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#include "executor/executor.h"
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@ -28,10 +27,8 @@
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#include "nodes/makefuncs.h"
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#include "nodes/nodeFuncs.h"
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#include "optimizer/clauses.h"
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#include "optimizer/tlist.h"
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#include "optimizer/var.h"
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#include "parser/analyze.h"
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#include "parser/parsetree.h"
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#include "tcop/tcopprot.h"
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#include "utils/acl.h"
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#include "utils/builtins.h"
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@ -45,12 +42,6 @@
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#define MAKEBOOLCONST(val,isnull) \
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((Node *) makeConst(BOOLOID, 1, (Datum) (val), (isnull), true))
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typedef struct
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{
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Query *query;
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List *groupClauses;
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} check_subplans_for_ungrouped_vars_context;
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typedef struct
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{
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int nargs;
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@ -64,8 +55,6 @@ static bool pull_agg_clause_walker(Node *node, List **listptr);
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static bool expression_returns_set_walker(Node *node, void *context);
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static bool contain_subplans_walker(Node *node, void *context);
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static bool pull_subplans_walker(Node *node, List **listptr);
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static bool check_subplans_for_ungrouped_vars_walker(Node *node,
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check_subplans_for_ungrouped_vars_context *context);
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static bool contain_mutable_functions_walker(Node *node, void *context);
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static bool contain_volatile_functions_walker(Node *node, void *context);
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static bool contain_nonstrict_functions_walker(Node *node, void *context);
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@ -552,157 +541,6 @@ pull_subplans_walker(Node *node, List **listptr)
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(void *) listptr);
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}
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/*
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* check_subplans_for_ungrouped_vars
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* Check for subplans that are being passed ungrouped variables as
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* parameters; generate an error message if any are found.
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*
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* In most contexts, ungrouped variables will be detected by the parser (see
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* parse_agg.c, check_ungrouped_columns()). But that routine currently does
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* not check subplans, because the necessary info is not computed until the
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* planner runs. So we do it here, after we have processed sublinks into
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* subplans. This ought to be cleaned up someday.
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*
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* A deficiency in this scheme is that any outer reference var must be
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* grouped by itself; we don't recognize groupable expressions within
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* subselects. For example, consider
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* SELECT
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* (SELECT x FROM bar where y = (foo.a + foo.b))
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* FROM foo
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* GROUP BY a + b;
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* This query will be rejected although it could be allowed.
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*/
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void
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check_subplans_for_ungrouped_vars(Query *query)
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{
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check_subplans_for_ungrouped_vars_context context;
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List *gl;
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context.query = query;
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/*
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* Build a list of the acceptable GROUP BY expressions for use in the
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* walker (to avoid repeated scans of the targetlist within the
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* recursive routine).
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*/
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context.groupClauses = NIL;
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foreach(gl, query->groupClause)
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{
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GroupClause *grpcl = lfirst(gl);
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Node *expr;
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expr = get_sortgroupclause_expr(grpcl, query->targetList);
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context.groupClauses = lcons(expr, context.groupClauses);
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}
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/*
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* Recursively scan the targetlist and the HAVING clause. WHERE and
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* JOIN/ON conditions are not examined, since they are evaluated
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* before grouping.
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*/
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check_subplans_for_ungrouped_vars_walker((Node *) query->targetList,
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&context);
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check_subplans_for_ungrouped_vars_walker(query->havingQual,
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&context);
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freeList(context.groupClauses);
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}
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static bool
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check_subplans_for_ungrouped_vars_walker(Node *node,
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check_subplans_for_ungrouped_vars_context *context)
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{
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List *gl;
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if (node == NULL)
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return false;
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if (IsA(node, Const) ||
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IsA(node, Param))
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return false; /* constants are always acceptable */
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/*
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* If we find an aggregate function, do not recurse into its
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* arguments. Subplans invoked within aggregate calls are allowed to
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* receive ungrouped variables. (This test and the next one should
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* match the logic in parse_agg.c's check_ungrouped_columns().)
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*/
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if (IsA(node, Aggref))
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return false;
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/*
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* Check to see if subexpression as a whole matches any GROUP BY item.
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* We need to do this at every recursion level so that we recognize
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* GROUPed-BY expressions before reaching variables within them.
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*/
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foreach(gl, context->groupClauses)
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{
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if (equal(node, lfirst(gl)))
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return false; /* acceptable, do not descend more */
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}
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/*
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* We can ignore Vars other than in subplan args lists, since the
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* parser already checked 'em.
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*/
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if (is_subplan(node))
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{
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/*
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* The args list of the subplan node represents attributes from
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* outside passed into the sublink.
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*/
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List *t;
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foreach(t, ((SubPlan *) node)->args)
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{
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Node *thisarg = lfirst(t);
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Var *var;
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bool contained_in_group_clause;
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/*
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* We do not care about args that are not local variables;
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* params or outer-level vars are not our responsibility to
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* check. (The outer-level query passing them to us needs to
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* worry, instead.)
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*/
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if (!IsA(thisarg, Var))
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continue;
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var = (Var *) thisarg;
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if (var->varlevelsup > 0)
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continue;
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/*
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* Else, see if it is a grouping column.
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*/
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contained_in_group_clause = false;
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foreach(gl, context->groupClauses)
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{
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if (equal(thisarg, lfirst(gl)))
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{
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contained_in_group_clause = true;
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break;
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}
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}
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if (!contained_in_group_clause)
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{
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/* Found an ungrouped argument. Complain. */
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RangeTblEntry *rte;
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char *attname;
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Assert(var->varno > 0 &&
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(int) var->varno <= length(context->query->rtable));
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rte = rt_fetch(var->varno, context->query->rtable);
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attname = get_rte_attribute_name(rte, var->varattno);
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elog(ERROR, "Sub-SELECT uses un-GROUPed attribute %s.%s from outer query",
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rte->eref->aliasname, attname);
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}
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}
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}
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return expression_tree_walker(node,
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check_subplans_for_ungrouped_vars_walker,
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(void *) context);
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}
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/*****************************************************************************
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* Check clauses for mutable functions
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.259 2003/01/02 19:29:22 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.260 2003/01/17 03:25:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -354,7 +354,7 @@ transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt)
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qry->hasSubLinks = pstate->p_hasSubLinks;
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qry->hasAggs = pstate->p_hasAggs;
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if (pstate->p_hasAggs)
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parseCheckAggregates(pstate, qry, qual);
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parseCheckAggregates(pstate, qry);
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return qry;
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}
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@ -575,7 +575,7 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
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qry->hasSubLinks = pstate->p_hasSubLinks;
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qry->hasAggs = pstate->p_hasAggs;
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if (pstate->p_hasAggs)
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parseCheckAggregates(pstate, qry, NULL);
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parseCheckAggregates(pstate, qry);
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return qry;
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}
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@ -1671,13 +1671,13 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
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qry->limitOffset = stmt->limitOffset;
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qry->limitCount = stmt->limitCount;
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qry->rtable = pstate->p_rtable;
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qry->jointree = makeFromExpr(pstate->p_joinlist, qual);
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qry->hasSubLinks = pstate->p_hasSubLinks;
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qry->hasAggs = pstate->p_hasAggs;
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if (pstate->p_hasAggs || qry->groupClause || qry->havingQual)
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parseCheckAggregates(pstate, qry, qual);
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qry->rtable = pstate->p_rtable;
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qry->jointree = makeFromExpr(pstate->p_joinlist, qual);
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parseCheckAggregates(pstate, qry);
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if (stmt->forUpdate != NIL)
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transformForUpdate(qry, stmt->forUpdate);
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@ -1900,13 +1900,13 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
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qry->limitOffset = limitOffset;
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qry->limitCount = limitCount;
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qry->rtable = pstate->p_rtable;
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qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
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qry->hasSubLinks = pstate->p_hasSubLinks;
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qry->hasAggs = pstate->p_hasAggs;
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if (pstate->p_hasAggs || qry->groupClause || qry->havingQual)
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parseCheckAggregates(pstate, qry, NULL);
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qry->rtable = pstate->p_rtable;
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qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
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parseCheckAggregates(pstate, qry);
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if (forUpdate != NIL)
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transformForUpdate(qry, forUpdate);
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@ -2146,7 +2146,7 @@ transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt)
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qry->hasSubLinks = pstate->p_hasSubLinks;
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qry->hasAggs = pstate->p_hasAggs;
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if (pstate->p_hasAggs)
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parseCheckAggregates(pstate, qry, qual);
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parseCheckAggregates(pstate, qry);
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/*
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* Now we are done with SELECT-like processing, and can get on with
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_agg.c,v 1.50 2002/06/20 20:29:32 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_agg.c,v 1.51 2003/01/17 03:25:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -24,10 +24,12 @@ typedef struct
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{
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ParseState *pstate;
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List *groupClauses;
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bool have_non_var_grouping;
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int sublevels_up;
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} check_ungrouped_columns_context;
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static void check_ungrouped_columns(Node *node, ParseState *pstate,
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List *groupClauses);
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List *groupClauses, bool have_non_var_grouping);
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static bool check_ungrouped_columns_walker(Node *node,
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check_ungrouped_columns_context *context);
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@ -39,24 +41,29 @@ static bool check_ungrouped_columns_walker(Node *node,
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* if any are found.
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*
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* NOTE: we assume that the given clause has been transformed suitably for
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* parser output. This means we can use the planner's expression_tree_walker.
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* parser output. This means we can use expression_tree_walker.
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*
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* NOTE: in the case of a SubLink, expression_tree_walker does not descend
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* into the subquery. This means we will fail to detect ungrouped columns
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* that appear as outer-level variables within a subquery. That case seems
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* unreasonably hard to handle here. Instead, we expect the planner to check
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* for ungrouped columns after it's found all the outer-level references
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* inside the subquery and converted them into a list of parameters for the
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* subquery.
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* NOTE: we recognize grouping expressions in the main query, but only
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* grouping Vars in subqueries. For example, this will be rejected,
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* although it could be allowed:
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* SELECT
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* (SELECT x FROM bar where y = (foo.a + foo.b))
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* FROM foo
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* GROUP BY a + b;
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* The difficulty is the need to account for different sublevels_up.
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* This appears to require a whole custom version of equal(), which is
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* way more pain than the feature seems worth.
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*/
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static void
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check_ungrouped_columns(Node *node, ParseState *pstate,
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List *groupClauses)
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List *groupClauses, bool have_non_var_grouping)
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{
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check_ungrouped_columns_context context;
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context.pstate = pstate;
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context.groupClauses = groupClauses;
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context.have_non_var_grouping = have_non_var_grouping;
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context.sublevels_up = 0;
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check_ungrouped_columns_walker(node, &context);
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}
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@ -68,32 +75,38 @@ check_ungrouped_columns_walker(Node *node,
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if (node == NULL)
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return false;
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if (IsA(node, Const) ||IsA(node, Param))
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if (IsA(node, Const) ||
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IsA(node, Param))
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return false; /* constants are always acceptable */
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/*
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* If we find an aggregate function, do not recurse into its
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* arguments.
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* arguments; ungrouped vars in the arguments are not an error.
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*/
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if (IsA(node, Aggref))
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return false;
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/*
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* Check to see if subexpression as a whole matches any GROUP BY item.
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* If we have any GROUP BY items that are not simple Vars,
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* check to see if subexpression as a whole matches any GROUP BY item.
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* We need to do this at every recursion level so that we recognize
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* GROUPed-BY expressions before reaching variables within them.
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* But this only works at the outer query level, as noted above.
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*/
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foreach(gl, context->groupClauses)
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if (context->have_non_var_grouping && context->sublevels_up == 0)
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{
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if (equal(node, lfirst(gl)))
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return false; /* acceptable, do not descend more */
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foreach(gl, context->groupClauses)
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{
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if (equal(node, lfirst(gl)))
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return false; /* acceptable, do not descend more */
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}
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}
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/*
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* If we have an ungrouped Var, we have a failure --- unless it is an
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* outer-level Var. In that case it's a constant as far as this query
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* level is concerned, and we can accept it. (If it's ungrouped as
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* far as the upper query is concerned, that's someone else's
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* If we have an ungrouped Var of the original query level, we have a
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* failure. Vars below the original query level are not a problem,
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* and neither are Vars from above it. (If such Vars are ungrouped as
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* far as their own query level is concerned, that's someone else's
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* problem...)
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*/
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if (IsA(node, Var))
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@ -102,17 +115,52 @@ check_ungrouped_columns_walker(Node *node,
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RangeTblEntry *rte;
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char *attname;
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if (var->varlevelsup > 0)
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return false; /* outer-level Var is acceptable */
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if (var->varlevelsup != context->sublevels_up)
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return false; /* it's not local to my query, ignore */
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/*
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* Check for a match, if we didn't do it above.
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*/
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if (!context->have_non_var_grouping || context->sublevels_up != 0)
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{
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foreach(gl, context->groupClauses)
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{
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Var *gvar = (Var *) lfirst(gl);
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if (IsA(gvar, Var) &&
|
||||
gvar->varno == var->varno &&
|
||||
gvar->varattno == var->varattno &&
|
||||
gvar->varlevelsup == 0)
|
||||
return false; /* acceptable, we're okay */
|
||||
}
|
||||
}
|
||||
|
||||
/* Found an ungrouped local variable; generate error message */
|
||||
Assert(var->varno > 0 &&
|
||||
(int) var->varno <= length(context->pstate->p_rtable));
|
||||
rte = rt_fetch(var->varno, context->pstate->p_rtable);
|
||||
attname = get_rte_attribute_name(rte, var->varattno);
|
||||
elog(ERROR, "Attribute %s.%s must be GROUPed or used in an aggregate function",
|
||||
rte->eref->aliasname, attname);
|
||||
if (context->sublevels_up == 0)
|
||||
elog(ERROR, "Attribute %s.%s must be GROUPed or used in an aggregate function",
|
||||
rte->eref->aliasname, attname);
|
||||
else
|
||||
elog(ERROR, "Sub-SELECT uses un-GROUPed attribute %s.%s from outer query",
|
||||
rte->eref->aliasname, attname);
|
||||
|
||||
}
|
||||
|
||||
if (IsA(node, Query))
|
||||
{
|
||||
/* Recurse into subselects */
|
||||
bool result;
|
||||
|
||||
context->sublevels_up++;
|
||||
result = query_tree_walker((Query *) node,
|
||||
check_ungrouped_columns_walker,
|
||||
(void *) context,
|
||||
0);
|
||||
context->sublevels_up--;
|
||||
return result;
|
||||
}
|
||||
/* Otherwise, recurse. */
|
||||
return expression_tree_walker(node, check_ungrouped_columns_walker,
|
||||
(void *) context);
|
||||
}
|
||||
@ -124,15 +172,13 @@ check_ungrouped_columns_walker(Node *node,
|
||||
* Ideally this should be done earlier, but it's difficult to distinguish
|
||||
* aggregates from plain functions at the grammar level. So instead we
|
||||
* check here. This function should be called after the target list and
|
||||
* qualifications are finalized. BUT: in some cases we want to call this
|
||||
* routine before we've assembled the joinlist and qual into a FromExpr.
|
||||
* So, rather than looking at qry->jointree, look at pstate->p_joinlist
|
||||
* and the explicitly-passed qual.
|
||||
* qualifications are finalized.
|
||||
*/
|
||||
void
|
||||
parseCheckAggregates(ParseState *pstate, Query *qry, Node *qual)
|
||||
parseCheckAggregates(ParseState *pstate, Query *qry)
|
||||
{
|
||||
List *groupClauses = NIL;
|
||||
bool have_non_var_grouping = false;
|
||||
List *tl;
|
||||
|
||||
/* This should only be called if we found aggregates, GROUP, or HAVING */
|
||||
@ -146,9 +192,9 @@ parseCheckAggregates(ParseState *pstate, Query *qry, Node *qual)
|
||||
* variable in the target list, which is outright misleading if the
|
||||
* problem is in WHERE.)
|
||||
*/
|
||||
if (contain_agg_clause(qual))
|
||||
if (contain_agg_clause(qry->jointree->quals))
|
||||
elog(ERROR, "Aggregates not allowed in WHERE clause");
|
||||
if (contain_agg_clause((Node *) pstate->p_joinlist))
|
||||
if (contain_agg_clause((Node *) qry->jointree->fromlist))
|
||||
elog(ERROR, "Aggregates not allowed in JOIN conditions");
|
||||
|
||||
/*
|
||||
@ -156,7 +202,8 @@ parseCheckAggregates(ParseState *pstate, Query *qry, Node *qual)
|
||||
*
|
||||
* While we are at it, build a list of the acceptable GROUP BY
|
||||
* expressions for use by check_ungrouped_columns() (this avoids
|
||||
* repeated scans of the targetlist within the recursive routine...)
|
||||
* repeated scans of the targetlist within the recursive routine...).
|
||||
* And detect whether any of the expressions aren't simple Vars.
|
||||
*/
|
||||
foreach(tl, qry->groupClause)
|
||||
{
|
||||
@ -164,16 +211,22 @@ parseCheckAggregates(ParseState *pstate, Query *qry, Node *qual)
|
||||
Node *expr;
|
||||
|
||||
expr = get_sortgroupclause_expr(grpcl, qry->targetList);
|
||||
if (expr == NULL)
|
||||
continue; /* probably cannot happen */
|
||||
if (contain_agg_clause(expr))
|
||||
elog(ERROR, "Aggregates not allowed in GROUP BY clause");
|
||||
groupClauses = lcons(expr, groupClauses);
|
||||
if (!IsA(expr, Var))
|
||||
have_non_var_grouping = true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the targetlist and HAVING clause for ungrouped variables.
|
||||
*/
|
||||
check_ungrouped_columns((Node *) qry->targetList, pstate, groupClauses);
|
||||
check_ungrouped_columns((Node *) qry->havingQual, pstate, groupClauses);
|
||||
check_ungrouped_columns((Node *) qry->targetList, pstate,
|
||||
groupClauses, have_non_var_grouping);
|
||||
check_ungrouped_columns((Node *) qry->havingQual, pstate,
|
||||
groupClauses, have_non_var_grouping);
|
||||
|
||||
/* Release the list storage (but not the pointed-to expressions!) */
|
||||
freeList(groupClauses);
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: clauses.h,v 1.60 2003/01/17 02:01:21 tgl Exp $
|
||||
* $Id: clauses.h,v 1.61 2003/01/17 03:25:04 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -52,7 +52,6 @@ extern bool expression_returns_set(Node *clause);
|
||||
|
||||
extern bool contain_subplans(Node *clause);
|
||||
extern List *pull_subplans(Node *clause);
|
||||
extern void check_subplans_for_ungrouped_vars(Query *query);
|
||||
|
||||
extern bool contain_mutable_functions(Node *clause);
|
||||
extern bool contain_volatile_functions(Node *clause);
|
||||
|
||||
@ -1,13 +1,12 @@
|
||||
/*-------------------------------------------------------------------------
|
||||
*
|
||||
* parse_agg.h
|
||||
*
|
||||
*
|
||||
* handle aggregates in parser
|
||||
*
|
||||
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: parse_agg.h,v 1.24 2002/06/20 20:29:51 momjian Exp $
|
||||
* $Id: parse_agg.h,v 1.25 2003/01/17 03:25:04 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -16,6 +15,6 @@
|
||||
|
||||
#include "parser/parse_node.h"
|
||||
|
||||
extern void parseCheckAggregates(ParseState *pstate, Query *qry, Node *qual);
|
||||
extern void parseCheckAggregates(ParseState *pstate, Query *qry);
|
||||
|
||||
#endif /* PARSE_AGG_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user