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>  The <SPAN
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>PostgreSQL</SPAN
> source distribution includes
  several examples of index operator classes for
  <ACRONYM
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>SP-GiST</ACRONYM
>.  The core system currently provides suffix
  trees over text columns and two types of trees over points: quad-tree and
  k-d tree.  Look into <TT
CLASS="FILENAME"
>src/backend/access/spgist/</TT
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