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Allow generalized expression syntax for partition bounds

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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/
This commit is contained in:
Peter Eisentraut
2019-01-25 11:27:59 +01:00
parent e3565fd61c
commit 7c079d7417
14 changed files with 315 additions and 168 deletions
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6
doc/src/sgml/ref/alter_table.sgml
View File

@ -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>

19
doc/src/sgml/ref/create_table.sgml
View File

@ -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>