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Support data-modifying commands (INSERT/UPDATE/DELETE) in WITH.

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This patch implements data-modifying WITH queries according to the
semantics that the updates all happen with the same command counter value,
and in an unspecified order.  Therefore one WITH clause can't see the
effects of another, nor can the outer query see the effects other than
through the RETURNING values.  And attempts to do conflicting updates will
have unpredictable results.  We'll need to document all that.

This commit just fixes the code; documentation updates are waiting on
author.

Marko Tiikkaja and Hitoshi Harada
This commit is contained in:
Tom Lane
2011-02-25 18:56:23 -05:00
parent 0056066d06
commit 389af95155
38 changed files with 1323 additions and 161 deletions
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14
src/backend/commands/view.c
View File

@ -418,6 +418,20 @@ DefineView(ViewStmt *stmt, const char *queryString)
viewParse->commandType != CMD_SELECT)
elog(ERROR, "unexpected parse analysis result");
/*
* Check for unsupported cases. These tests are redundant with ones in
* DefineQueryRewrite(), but that function will complain about a bogus
* ON SELECT rule, and we'd rather the message complain about a view.
*/
if (viewParse->intoClause != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("views must not contain SELECT INTO")));
if (viewParse->hasModifyingCTE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("views must not contain data-modifying statements in WITH")));
/*
* If a list of column names was given, run through and insert these into
* the actual query tree. - thomas 2000-03-08