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Implement SQL-standard WITH clauses, including WITH RECURSIVE.

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There are some unimplemented aspects: recursive queries must use UNION ALL
(should allow UNION too), and we don't have SEARCH or CYCLE clauses.
These might or might not get done for 8.4, but even without them it's a
pretty useful feature.

There are also a couple of small loose ends and definitional quibbles,
which I'll send a memo about to pgsql-hackers shortly.  But let's land
the patch now so we can get on with other development.

Yoshiyuki Asaba, with lots of help from Tatsuo Ishii and Tom Lane
This commit is contained in:
Tom Lane
2008-10-04 21:56:55 +00:00
parent 607b2be7bb
commit 44d5be0e53
77 changed files with 5893 additions and 313 deletions
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9
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.141 2008/09/01 20:42:45 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.142 2008/10/04 21:56:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -386,6 +386,7 @@ typedef struct BoolExpr
* ROWCOMPARE_SUBLINK (lefthand) op (SELECT ...)
* EXPR_SUBLINK (SELECT with single targetlist item ...)
* ARRAY_SUBLINK ARRAY(SELECT with single targetlist item ...)
* CTE_SUBLINK WITH query (never actually part of an expression)
* For ALL, ANY, and ROWCOMPARE, the lefthand is a list of expressions of the
* same length as the subselect's targetlist. ROWCOMPARE will *always* have
* a list with more than one entry; if the subselect has just one target
@@ -412,6 +413,9 @@ typedef struct BoolExpr
*
* In EXISTS, EXPR, and ARRAY SubLinks, testexpr and operName are unused and
* are always null.
*
* The CTE_SUBLINK case never occurs in actual SubLink nodes, but it is used
* in SubPlans generated for WITH subqueries.
*/
typedef enum SubLinkType
{
@@ -420,7 +424,8 @@ typedef enum SubLinkType
ANY_SUBLINK,
ROWCOMPARE_SUBLINK,
EXPR_SUBLINK,
ARRAY_SUBLINK
ARRAY_SUBLINK,
CTE_SUBLINK /* for SubPlans only */
} SubLinkType;