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Allow I/O conversion casts to be applied to or from any type that is a member

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of the STRING type category, thereby opening up the mechanism for user-defined
types.  This is mainly for the benefit of citext, though; there aren't likely
to be a lot of types that are all general-purpose character strings.
Per discussion with David Wheeler.
This commit is contained in:
Tom Lane
2008-07-30 21:23:17 +00:00
parent 7df49cef72
commit c8572986ad
4 changed files with 43 additions and 32 deletions
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14
src/backend/parser/parse_coerce.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.162 2008/07/30 17:05:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.163 2008/07/30 21:23:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1796,8 +1796,8 @@ find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId,
/*
* If we still haven't found a possibility, consider automatic casting
* using I/O functions. We allow assignment casts to textual types
* and explicit casts from textual types to be handled this way. (The
* using I/O functions. We allow assignment casts to string types
* and explicit casts from string types to be handled this way. (The
* CoerceViaIO mechanism is a lot more general than that, but this is
* all we want to allow in the absence of a pg_cast entry.) It would
* probably be better to insist on explicit casts in both directions,
@ -1807,14 +1807,10 @@ find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId,
if (result == COERCION_PATH_NONE)
{
if (ccontext >= COERCION_ASSIGNMENT &&
(targetTypeId == TEXTOID ||
targetTypeId == VARCHAROID ||
targetTypeId == BPCHAROID))
TypeCategory(targetTypeId) == TYPCATEGORY_STRING)
result = COERCION_PATH_COERCEVIAIO;
else if (ccontext >= COERCION_EXPLICIT &&
(sourceTypeId == TEXTOID ||
sourceTypeId == VARCHAROID ||
sourceTypeId == BPCHAROID))
TypeCategory(sourceTypeId) == TYPCATEGORY_STRING)
result = COERCION_PATH_COERCEVIAIO;
}
}