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Fix WITH attached to a nested set operation (UNION/INTERSECT/EXCEPT).

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Parse analysis neglected to cover the case of a WITH clause attached to an
intermediate-level set operation; it only handled WITH at the top level
or WITH attached to a leaf-level SELECT.  Per report from Adam Mackler.

In HEAD, I rearranged the order of SelectStmt's fields to put withClause
with the other fields that can appear on non-leaf SelectStmts.  In back
branches, leave it alone to avoid a possible ABI break for third-party
code.

Back-patch to 8.4 where WITH support was added.
This commit is contained in:
Tom Lane
2012-07-31 17:56:21 -04:00
parent b76356ac22
commit f6ce81f55a
10 changed files with 123 additions and 21 deletions
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29
src/backend/parser/analyze.c
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@@ -1322,6 +1322,7 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
Node *limitOffset;
Node *limitCount;
List *lockingClause;
WithClause *withClause;
Node *node;
ListCell *left_tlist,
*lct,
@@ -1338,14 +1339,6 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
qry->commandType = CMD_SELECT;
/* process the WITH clause independently of all else */
if (stmt->withClause)
{
qry->hasRecursive = stmt->withClause->recursive;
qry->cteList = transformWithClause(pstate, stmt->withClause);
qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
}
/*
* Find leftmost leaf SelectStmt. We currently only need to do this in
* order to deliver a suitable error message if there's an INTO clause
@@ -1375,11 +1368,13 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
limitOffset = stmt->limitOffset;
limitCount = stmt->limitCount;
lockingClause = stmt->lockingClause;
withClause = stmt->withClause;
stmt->sortClause = NIL;
stmt->limitOffset = NULL;
stmt->limitCount = NULL;
stmt->lockingClause = NIL;
stmt->withClause = NULL;
/* We don't support FOR UPDATE/SHARE with set ops at the moment. */
if (lockingClause)
@@ -1387,6 +1382,14 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE is not allowed with UNION/INTERSECT/EXCEPT")));
/* Process the WITH clause independently of all else */
if (withClause)
{
qry->hasRecursive = withClause->recursive;
qry->cteList = transformWithClause(pstate, withClause);
qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
}
/*
* Recursively transform the components of the tree.
*/
@@ -1572,10 +1575,10 @@ transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
errmsg("SELECT FOR UPDATE/SHARE is not allowed with UNION/INTERSECT/EXCEPT")));
/*
* If an internal node of a set-op tree has ORDER BY, LIMIT, or FOR UPDATE
* clauses attached, we need to treat it like a leaf node to generate an
* independent sub-Query tree. Otherwise, it can be represented by a
* SetOperationStmt node underneath the parent Query.
* If an internal node of a set-op tree has ORDER BY, LIMIT, FOR UPDATE,
* or WITH clauses attached, we need to treat it like a leaf node to
* generate an independent sub-Query tree. Otherwise, it can be
* represented by a SetOperationStmt node underneath the parent Query.
*/
if (stmt->op == SETOP_NONE)
{
@@ -1586,7 +1589,7 @@ transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
{
Assert(stmt->larg != NULL && stmt->rarg != NULL);
if (stmt->sortClause || stmt->limitOffset || stmt->limitCount ||
stmt->lockingClause)
stmt->lockingClause || stmt->withClause)
isLeaf = true;
else
isLeaf = false;