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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-01-27 18:11:50 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-01-27 18:11:50 +0000 |
| commit | dd979f66be20fc54aad06da743f788fbc505bbe1 (patch) | |
| tree | 4d6b578e0afc7dc0198296940cd77c79c5eff66c /src/include/executor/nodeGroup.h | |
| parent | 3f0074e403ac3a145c5e43db3348f45fe084703d (diff) | |
| download | postgresql-dd979f66be20fc54aad06da743f788fbc505bbe1.tar.gz postgresql-dd979f66be20fc54aad06da743f788fbc505bbe1.zip | |
Redesign DISTINCT ON as discussed in pgsql-sql 1/25/00: syntax is now
SELECT DISTINCT ON (expr [, expr ...]) targetlist ...
and there is a check to make sure that the user didn't specify an ORDER BY
that's incompatible with the DISTINCT operation.
Reimplement nodeUnique and nodeGroup to use the proper datatype-specific
equality function for each column being compared --- they used to do
bitwise comparisons or convert the data to text strings and strcmp().
(To add insult to injury, they'd look up the conversion functions once
for each tuple...) Parse/plan representation of DISTINCT is now a list
of SortClause nodes.
initdb forced by querytree change...
Diffstat (limited to 'src/include/executor/nodeGroup.h')
| -rw-r--r-- | src/include/executor/nodeGroup.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/include/executor/nodeGroup.h b/src/include/executor/nodeGroup.h index afe510d5eaf..dd104b0af94 100644 --- a/src/include/executor/nodeGroup.h +++ b/src/include/executor/nodeGroup.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: nodeGroup.h,v 1.14 2000/01/26 23:48:05 tgl Exp $ + * $Id: nodeGroup.h,v 1.15 2000/01/27 18:11:41 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -22,4 +22,14 @@ extern int ExecCountSlotsGroup(Group *node); extern void ExecEndGroup(Group *node); extern void ExecReScanGroup(Group *node, ExprContext *exprCtxt, Plan *parent); +extern bool execTuplesMatch(HeapTuple tuple1, + HeapTuple tuple2, + TupleDesc tupdesc, + int numCols, + AttrNumber *matchColIdx, + FmgrInfo *eqfunctions); +extern FmgrInfo *execTuplesMatchPrepare(TupleDesc tupdesc, + int numCols, + AttrNumber *matchColIdx); + #endif /* NODEGROUP_H */ |