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Create the system catalog infrastructure needed for KNNGIST.

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This commit adds columns amoppurpose and amopsortfamily to pg_amop, and
column amcanorderbyop to pg_am.  For the moment all the entries in
amcanorderbyop are "false", since the underlying support isn't there yet.

Also, extend the CREATE OPERATOR CLASS/ALTER OPERATOR FAMILY commands with
[ FOR SEARCH | FOR ORDER BY sort_operator_family ] clauses to allow the new
columns of pg_amop to be populated, and create pg_dump support for dumping
that information.

I also added some documentation, although it's perhaps a bit premature
given that the feature doesn't do anything useful yet.

Teodor Sigaev, Robert Haas, Tom Lane
This commit is contained in:
Tom Lane
2010-11-24 14:20:39 -05:00
parent 4fc09ad00c
commit 725d52d0c2
21 changed files with 913 additions and 475 deletions
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18
doc/src/sgml/ref/create_opclass.sgml
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@@ -23,7 +23,7 @@ PostgreSQL documentation
<synopsis>
CREATE OPERATOR CLASS <replaceable class="parameter">name</replaceable> [ DEFAULT ] FOR TYPE <replaceable class="parameter">data_type</replaceable>
USING <replaceable class="parameter">index_method</replaceable> [ FAMILY <replaceable class="parameter">family_name</replaceable> ] AS
{ OPERATOR <replaceable class="parameter">strategy_number</replaceable> <replaceable class="parameter">operator_name</replaceable> [ ( <replaceable class="parameter">op_type</replaceable>, <replaceable class="parameter">op_type</replaceable> ) ]
{ OPERATOR <replaceable class="parameter">strategy_number</replaceable> <replaceable class="parameter">operator_name</replaceable> [ ( <replaceable class="parameter">op_type</replaceable>, <replaceable class="parameter">op_type</replaceable> ) ] [ FOR SEARCH | FOR ORDER BY <replaceable class="parameter">sort_family_name</replaceable> ]
| FUNCTION <replaceable class="parameter">support_number</replaceable> [ ( <replaceable class="parameter">op_type</replaceable> [ , <replaceable class="parameter">op_type</replaceable> ] ) ] <replaceable class="parameter">function_name</replaceable> ( <replaceable class="parameter">argument_type</replaceable> [, ...] )
| STORAGE <replaceable class="parameter">storage_type</replaceable>
} [, ... ]
@@ -180,6 +180,22 @@ CREATE OPERATOR CLASS <replaceable class="parameter">name</replaceable> [ DEFAUL
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">sort_family_name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an existing btree operator
family that describes the sort ordering associated with an ordering
operator.
</para>
<para>
If neither <literal>FOR SEARCH</> nor <literal>FOR ORDER BY</> is
specified, <literal>FOR SEARCH</> is the default.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">support_number</replaceable></term>
<listitem>