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Extend CTE patch to support recursive UNION (ie, without ALL). The

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implementation uses an in-memory hash table, so it will poop out for very
large recursive results ... but the performance characteristics of a
sort-based implementation would be pretty unpleasant too.
This commit is contained in:
Tom Lane
2008-10-07 19:27:04 +00:00
parent 059349be0c
commit 0d115dde82
13 changed files with 345 additions and 74 deletions
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9
src/backend/nodes/copyfuncs.c
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@@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.407 2008/10/06 17:39:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.408 2008/10/07 19:27:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -193,6 +193,13 @@ _copyRecursiveUnion(RecursiveUnion *from)
* copy remainder of node
*/
COPY_SCALAR_FIELD(wtParam);
COPY_SCALAR_FIELD(numCols);
if (from->numCols > 0)
{
COPY_POINTER_FIELD(dupColIdx, from->numCols * sizeof(AttrNumber));
COPY_POINTER_FIELD(dupOperators, from->numCols * sizeof(Oid));
}
COPY_SCALAR_FIELD(numGroups);
return newnode;
}