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Add CREATE COLLATION IF NOT EXISTS clause

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The core of the functionality was already implemented when
pg_import_system_collations was added.  This just exposes it as an
option in the SQL command.
This commit is contained in:
Peter Eisentraut
2017-02-08 22:51:09 -05:00
parent e403732ef6
commit 6d16ecc646
10 changed files with 47 additions and 6 deletions
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15
doc/src/sgml/ref/create_collation.sgml
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@ -18,12 +18,12 @@
<refsynopsisdiv>
<synopsis>
CREATE COLLATION <replaceable>name</replaceable> (
CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> (
[ LOCALE = <replaceable>locale</replaceable>, ]
[ LC_COLLATE = <replaceable>lc_collate</replaceable>, ]
[ LC_CTYPE = <replaceable>lc_ctype</replaceable> ]
)
CREATE COLLATION <replaceable>name</replaceable> FROM <replaceable>existing_collation</replaceable>
CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> FROM <replaceable>existing_collation</replaceable>
</synopsis>
</refsynopsisdiv>
@ -47,6 +47,17 @@ CREATE COLLATION <replaceable>name</replaceable> FROM <replaceable>existing_coll
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>IF NOT EXISTS</literal></term>
<listitem>
<para>
Do not throw an error if a collation with the same name already exists.
A notice is issued in this case. Note that there is no guarantee that
the existing collation is anything like the one that would have been created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>name</replaceable></term>