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NAME="CATALOG-PG-RANGE"
>45.36. <TT
CLASS="STRUCTNAME"
>pg_range</TT
></A
></H1
><P
> The catalog <TT
CLASS="STRUCTNAME"
>pg_range</TT
> stores information about
range types. This is in addition to the types' entries in
<A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
>.
</P
><DIV
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><P
><B
>Table 45-36. <TT
CLASS="STRUCTNAME"
>pg_range</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngtypid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
>.oid</TT
></TD
><TD
>OID of the range type</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngsubtype</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
>.oid</TT
></TD
><TD
>OID of the element type (subtype) of this range type</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngcollation</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-collation.html"
><TT
CLASS="STRUCTNAME"
>pg_collation</TT
></A
>.oid</TT
></TD
><TD
>OID of the collation used for range comparisons, or 0 if none</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngsubopc</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
>.oid</TT
></TD
><TD
>OID of the subtype's operator class used for range comparisons</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngcanonical</TT
></TD
><TD
><TT
CLASS="TYPE"
>regproc</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
>OID of the function to convert a range value into canonical form,
or 0 if none</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngsubdiff</TT
></TD
><TD
><TT
CLASS="TYPE"
>regproc</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
>OID of the function to return the difference between two element
values as <TT
CLASS="TYPE"
>double precision</TT
>, or 0 if none</TD
></TR
></TBODY
></TABLE
></DIV
><P
> <TT
CLASS="STRUCTFIELD"
>rngsubopc</TT
> (plus <TT
CLASS="STRUCTFIELD"
>rngcollation</TT
>, if the
element type is collatable) determines the sort ordering used by the range
type. <TT
CLASS="STRUCTFIELD"
>rngcanonical</TT
> is used when the element type is
discrete. <TT
CLASS="STRUCTFIELD"
>rngsubdiff</TT
> is optional but should be supplied to
improve performance of GiST indexes on the range type.
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