database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-30 11:03:19 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

9
src/backend/nodes/copyfuncs.c
View File

@ -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;
}

15
src/backend/nodes/outfuncs.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.341 2008/10/06 17:39:26 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.342 2008/10/07 19:27:04 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -334,11 +334,24 @@ _outAppend(StringInfo str, Append *node)
static void
_outRecursiveUnion(StringInfo str, RecursiveUnion *node)
{
int i;
WRITE_NODE_TYPE("RECURSIVEUNION");
_outPlanInfo(str, (Plan *) node);
WRITE_INT_FIELD(wtParam);
WRITE_INT_FIELD(numCols);
appendStringInfo(str, " :dupColIdx");
for (i = 0; i < node->numCols; i++)
appendStringInfo(str, " %d", node->dupColIdx[i]);
appendStringInfo(str, " :dupOperators");
for (i = 0; i < node->numCols; i++)
appendStringInfo(str, " %u", node->dupOperators[i]);
WRITE_LONG_FIELD(numGroups);
}
static void