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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-04-07 16:22:13 -0400 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-04-07 16:22:13 -0400 |
| commit | 357889eb17bb9c9336c4f324ceb1651da616fe57 (patch) | |
| tree | ef30422c7a6ebc2844492bd045ffbfeb30e54516 /src/backend/nodes/outfuncs.c | |
| parent | 26a944cf29ba67bb49f42656dd2be98fe2485f5f (diff) | |
| download | postgresql-357889eb17bb9c9336c4f324ceb1651da616fe57.tar.gz postgresql-357889eb17bb9c9336c4f324ceb1651da616fe57.zip | |
Support FETCH FIRST WITH TIES
WITH TIES is an option to the FETCH FIRST N ROWS clause (the SQL
standard's spelling of LIMIT), where you additionally get rows that
compare equal to the last of those N rows by the columns in the
mandatory ORDER BY clause.
There was a proposal by Andrew Gierth to implement this functionality in
a more powerful way that would yield more features, but the other patch
had not been finished at this time, so we decided to use this one for
now in the spirit of incremental development.
Author: Surafel Temesgen <surafel3000@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Discussion: https://postgr.es/m/CALAY4q9ky7rD_A4vf=FVQvCGngm3LOes-ky0J6euMrg=_Se+ag@mail.gmail.com
Discussion: https://postgr.es/m/87o8wvz253.fsf@news-spur.riddles.org.uk
Diffstat (limited to 'src/backend/nodes/outfuncs.c')
| -rw-r--r-- | src/backend/nodes/outfuncs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c index 35ed8c0d538..5b826509ebe 100644 --- a/src/backend/nodes/outfuncs.c +++ b/src/backend/nodes/outfuncs.c @@ -931,6 +931,11 @@ _outLimit(StringInfo str, const Limit *node) WRITE_NODE_FIELD(limitOffset); WRITE_NODE_FIELD(limitCount); + WRITE_ENUM_FIELD(limitOption, LimitOption); + WRITE_INT_FIELD(uniqNumCols); + WRITE_ATTRNUMBER_ARRAY(uniqColIdx, node->uniqNumCols); + WRITE_OID_ARRAY(uniqOperators, node->uniqNumCols); + WRITE_OID_ARRAY(uniqCollations, node->uniqNumCols); } static void @@ -2741,6 +2746,7 @@ _outSelectStmt(StringInfo str, const SelectStmt *node) WRITE_NODE_FIELD(sortClause); WRITE_NODE_FIELD(limitOffset); WRITE_NODE_FIELD(limitCount); + WRITE_ENUM_FIELD(limitOption, LimitOption); WRITE_NODE_FIELD(lockingClause); WRITE_NODE_FIELD(withClause); WRITE_ENUM_FIELD(op, SetOperation); @@ -2952,6 +2958,7 @@ _outQuery(StringInfo str, const Query *node) WRITE_NODE_FIELD(sortClause); WRITE_NODE_FIELD(limitOffset); WRITE_NODE_FIELD(limitCount); + WRITE_ENUM_FIELD(limitOption, LimitOption); WRITE_NODE_FIELD(rowMarks); WRITE_NODE_FIELD(setOperations); WRITE_NODE_FIELD(constraintDeps); |