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><A
NAME="CATALOG-PG-CAST"
>43.8. <TT
CLASS="STRUCTNAME"
>pg_cast</TT
></A
></H1
><A
NAME="AEN49448"
></A
><P
> The catalog <TT
CLASS="STRUCTNAME"
>pg_cast</TT
> stores data type conversion paths,
both built-in paths and those defined with <TT
CLASS="COMMAND"
>CREATE CAST</TT
>.
</P
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><B
>Table 43-8. <TT
CLASS="STRUCTFIELD"
>pg_cast</TT
> Columns</B
></P
><TABLE
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><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"
>castsource</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 source data type</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>casttarget</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 target data type</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>castfunc</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
> The OID of the function to use to perform this cast. Zero is
stored if the data types are binary compatible (that is, no
run-time operation is needed to perform the cast).
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>castcontext</TT
></TD
><TD
><TT
CLASS="TYPE"
>char</TT
></TD
><TD
> </TD
><TD
> Indicates what contexts the cast may be invoked in.
<TT
CLASS="LITERAL"
>e</TT
> means only as an explicit cast (using
<TT
CLASS="LITERAL"
>CAST</TT
>, <TT
CLASS="LITERAL"
>::</TT
>, or function-call syntax).
<TT
CLASS="LITERAL"
>a</TT
> means implicitly in assignment
to a target column, as well as explicitly.
<TT
CLASS="LITERAL"
>i</TT
> means implicitly in expressions, as well as the
other cases.
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