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>  The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> source distribution includes
  <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> operator classes for <TT
CLASS="TYPE"
>tsvector</TT
> and
  for one-dimensional arrays of all internal types.  Prefix searching in
  <TT
CLASS="TYPE"
>tsvector</TT
> is implemented using the <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> partial match
  feature.
  The following <TT
CLASS="FILENAME"
>contrib</TT
> modules also contain
  <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> operator classes:

 <P
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><DT
><TT
CLASS="FILENAME"
>btree_gin</TT
></DT
><DD
><P
>B-tree equivalent functionality for several data types</P
></DD
><DT
><TT
CLASS="FILENAME"
>hstore</TT
></DT
><DD
><P
>Module for storing (key, value) pairs</P
></DD
><DT
><TT
CLASS="FILENAME"
>intarray</TT
></DT
><DD
><P
>Enhanced support for <TT
CLASS="TYPE"
>int[]</TT
></P
></DD
><DT
><TT
CLASS="FILENAME"
>pg_trgm</TT
></DT
><DD
><P
>Text similarity using trigram matching</P
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