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>  The <SPAN
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>PostgreSQL</SPAN
> source distribution includes
  several examples of index methods implemented using
  <ACRONYM
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>GiST</ACRONYM
>.  The core system currently provides R-Tree
  equivalent functionality for some of the built-in geometric data types
  (see <TT
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>).  The following
  <TT
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> modules also contain <ACRONYM
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>
  operator classes: 
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><DT
>btree_gist</DT
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>B-Tree equivalent functionality for several data types</P
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>cube</DT
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>Indexing for multi-dimensional cubes</P
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><DT
>intarray</DT
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>RD-Tree for one-dimensional array of int4 values</P
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>ltree</DT
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>Indexing for tree-like structures</P
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>Text similarity using trigram matching</P
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><P
>Indexing for <SPAN
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