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| author | Peter Eisentraut <peter@eisentraut.org> | 2019-01-25 11:27:59 +0100 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2019-01-25 11:28:49 +0100 |
| commit | 7c079d7417a8f2d4bf5144732e2f85117db9214f (patch) | |
| tree | fccf611233c0019d18c0680d0b7a78513e937b2c /doc/src | |
| parent | e3565fd61cee16414a682d2be0d44c112a80a30c (diff) | |
| download | postgresql-7c079d7417a8f2d4bf5144732e2f85117db9214f.tar.gz postgresql-7c079d7417a8f2d4bf5144732e2f85117db9214f.zip | |
Allow generalized expression syntax for partition bounds
Previously, only literals were allowed. This change allows general
expressions, including functions calls, which are evaluated at the
time the DDL command is executed.
Besides offering some more functionality, it simplifies the parser
structures and removes some inconsistencies in how the literals were
handled.
Author: Kyotaro Horiguchi, Tom Lane, Amit Langote
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/9f88b5e0-6da2-5227-20d0-0d7012beaa1c@lab.ntt.co.jp/
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/alter_table.sgml | 6 | ||||
| -rw-r--r-- | doc/src/sgml/ref/create_table.sgml | 19 |
2 files changed, 13 insertions, 12 deletions
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml index 0d1feaf828c..0aa0f093f23 100644 --- a/doc/src/sgml/ref/alter_table.sgml +++ b/doc/src/sgml/ref/alter_table.sgml @@ -86,9 +86,9 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> <phrase>and <replaceable class="parameter">partition_bound_spec</replaceable> is:</phrase> -IN ( { <replaceable class="parameter">numeric_literal</replaceable> | <replaceable class="parameter">string_literal</replaceable> | TRUE | FALSE | NULL } [, ...] ) | -FROM ( { <replaceable class="parameter">numeric_literal</replaceable> | <replaceable class="parameter">string_literal</replaceable> | TRUE | FALSE | MINVALUE | MAXVALUE } [, ...] ) - TO ( { <replaceable class="parameter">numeric_literal</replaceable> | <replaceable class="parameter">string_literal</replaceable> | TRUE | FALSE | MINVALUE | MAXVALUE } [, ...] ) | +IN ( <replaceable class="parameter">partition_bound_expr</replaceable> [, ...] ) | +FROM ( { <replaceable class="parameter">partition_bound_expr</replaceable> | MINVALUE | MAXVALUE } [, ...] ) + TO ( { <replaceable class="parameter">partition_bound_expr</replaceable> | MINVALUE | MAXVALUE } [, ...] ) | WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REMAINDER <replaceable class="parameter">numeric_literal</replaceable> ) <phrase>and <replaceable class="parameter">column_constraint</replaceable> is:</phrase> diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml index 857515ec8f2..22dbc07b238 100644 --- a/doc/src/sgml/ref/create_table.sgml +++ b/doc/src/sgml/ref/create_table.sgml @@ -87,9 +87,9 @@ class="parameter">referential_action</replaceable> ] [ ON UPDATE <replaceable cl <phrase>and <replaceable class="parameter">partition_bound_spec</replaceable> is:</phrase> -IN ( { <replaceable class="parameter">numeric_literal</replaceable> | <replaceable class="parameter">string_literal</replaceable> | TRUE | FALSE | NULL } [, ...] ) | -FROM ( { <replaceable class="parameter">numeric_literal</replaceable> | <replaceable class="parameter">string_literal</replaceable> | TRUE | FALSE | MINVALUE | MAXVALUE } [, ...] ) - TO ( { <replaceable class="parameter">numeric_literal</replaceable> | <replaceable class="parameter">string_literal</replaceable> | TRUE | FALSE | MINVALUE | MAXVALUE } [, ...] ) | +IN ( <replaceable class="parameter">partition_bound_expr</replaceable> [, ...] ) | +FROM ( { <replaceable class="parameter">partition_bound_expr</replaceable> | MINVALUE | MAXVALUE } [, ...] ) + TO ( { <replaceable class="parameter">partition_bound_expr</replaceable> | MINVALUE | MAXVALUE } [, ...] ) | WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REMAINDER <replaceable class="parameter">numeric_literal</replaceable> ) <phrase><replaceable class="parameter">index_parameters</replaceable> in <literal>UNIQUE</literal>, <literal>PRIMARY KEY</literal>, and <literal>EXCLUDE</literal> constraints are:</phrase> @@ -413,12 +413,13 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM </para> <para> - Each of the values specified in - the <replaceable class="parameter">partition_bound_spec</replaceable> is - a literal, <literal>NULL</literal>, <literal>MINVALUE</literal>, or - <literal>MAXVALUE</literal>. Each literal value must be either a - numeric constant that is coercible to the corresponding partition key - column's type, or a string literal that is valid input for that type. + <replaceable class="parameter">partition_bound_expr</replaceable> is + any variable-free expression (subqueries, window functions, aggregate + functions, and set-returning functions are not allowed). Its data type + must match the data type of the corresponding partition key column. + The expression is evaluated once at table creation time, so it can + even contain volatile expressions such as + <literal><function>CURRENT_TIMESTAMP</function></literal>. </para> <para> |