Sophie: postgresql9.4-docs-9.4.15-1.mga6 noarch

postgresql9.4-docs-9.4.15-1.mga6.noarch.rpm

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><A
NAME="BTREE-GIN"
>F.4. btree_gin</A
></H1
><P
>  <TT
CLASS="FILENAME"
>btree_gin</TT
> provides sample GIN operator classes that
  implement B-tree equivalent behavior for the data types
  <TT
CLASS="TYPE"
>int2</TT
>, <TT
CLASS="TYPE"
>int4</TT
>, <TT
CLASS="TYPE"
>int8</TT
>, <TT
CLASS="TYPE"
>float4</TT
>,
  <TT
CLASS="TYPE"
>float8</TT
>, <TT
CLASS="TYPE"
>timestamp with time zone</TT
>,
  <TT
CLASS="TYPE"
>timestamp without time zone</TT
>, <TT
CLASS="TYPE"
>time with time zone</TT
>,
  <TT
CLASS="TYPE"
>time without time zone</TT
>, <TT
CLASS="TYPE"
>date</TT
>, <TT
CLASS="TYPE"
>interval</TT
>,
  <TT
CLASS="TYPE"
>oid</TT
>, <TT
CLASS="TYPE"
>money</TT
>, <TT
CLASS="TYPE"
>"char"</TT
>,
  <TT
CLASS="TYPE"
>varchar</TT
>, <TT
CLASS="TYPE"
>text</TT
>, <TT
CLASS="TYPE"
>bytea</TT
>, <TT
CLASS="TYPE"
>bit</TT
>,
  <TT
CLASS="TYPE"
>varbit</TT
>, <TT
CLASS="TYPE"
>macaddr</TT
>, <TT
CLASS="TYPE"
>inet</TT
>, and <TT
CLASS="TYPE"
>cidr</TT
>.
 </P
><P
>  In general, these operator classes will not outperform the equivalent
  standard B-tree index methods, and they lack one major feature of the
  standard B-tree code: the ability to enforce uniqueness.  However,
  they are useful for GIN testing and as a base for developing other
  GIN operator classes.  Also, for queries that test both a GIN-indexable
  column and a B-tree-indexable column, it might be more efficient to create
  a multicolumn GIN index that uses one of these operator classes than to create
  two separate indexes that would have to be combined via bitmap ANDing.
 </P
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><A
NAME="AEN163169"
>F.4.1. Example Usage</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>CREATE TABLE test (a int4);
-- create index
CREATE INDEX testidx ON test USING gin (a);
-- query
SELECT * FROM test WHERE a &lt; 10;</PRE
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><A
NAME="AEN163172"
>F.4.2. Authors</A
></H2
><P
>   Teodor Sigaev (<CODE
CLASS="EMAIL"
>&#60;<A
HREF="mailto:teodor@stack.net"
>teodor@stack.net</A
>&#62;</CODE
>) and
   Oleg Bartunov (<CODE
CLASS="EMAIL"
>&#60;<A
HREF="mailto:oleg@sai.msu.su"
>oleg@sai.msu.su</A
>&#62;</CODE
>).  See
   <A
HREF="http://www.sai.msu.su/~megera/oddmuse/index.cgi/Gin"
TARGET="_top"
>http://www.sai.msu.su/~megera/oddmuse/index.cgi/Gin</A
>
   for additional information.
  </P
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