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| author | Peter Eisentraut <peter@eisentraut.org> | 2020-11-19 09:24:37 +0100 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2020-11-19 09:32:47 +0100 |
| commit | 01e658fa74cb7e3292448f6663b549135958003b (patch) | |
| tree | d87a206912e085d7bcdadc424b571055055e58e2 /doc/src | |
| parent | 7888b0999488511e4266f2134053fa3a6505a155 (diff) | |
| download | postgresql-01e658fa74cb7e3292448f6663b549135958003b.tar.gz postgresql-01e658fa74cb7e3292448f6663b549135958003b.zip | |
Hash support for row types
Add hash functions for the record type as well as a hash operator
family and operator class for the record type. This enables all the
hash functionality for the record type such as hash-based plans for
UNION/INTERSECT/EXCEPT DISTINCT, recursive queries using UNION
DISTINCT, hash joins, and hash partitioning.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/38eccd35-4e2d-6767-1b3c-dada1eac3124%402ndquadrant.com
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/queries.sgml | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/doc/src/sgml/queries.sgml b/doc/src/sgml/queries.sgml index dedb5684e63..ca512048756 100644 --- a/doc/src/sgml/queries.sgml +++ b/doc/src/sgml/queries.sgml @@ -2182,15 +2182,6 @@ SELECT * FROM search_tree <emphasis>ORDER BY path</emphasis>; </programlisting> </para> - <note> - <para> - The queries shown in this and the following section involving - <literal>ROW</literal> constructors in the target list only support - <literal>UNION ALL</literal> (not plain <literal>UNION</literal>) in the - current implementation. - </para> - </note> - <tip> <para> Omit the <literal>ROW()</literal> syntax in the common case where only one |