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Downgrade implicit casts to text to be assignment-only, except for the ones

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from the other string-category types; this eliminates a lot of surprising
interpretations that the parser could formerly make when there was no directly
applicable operator.

Create a general mechanism that supports casts to and from the standard string
types (text,varchar,bpchar) for *every* datatype, by invoking the datatype's
I/O functions.  These new casts are assignment-only in the to-string direction,
explicit-only in the other, and therefore should create no surprising behavior.
Remove a bunch of thereby-obsoleted datatype-specific casting functions.

The "general mechanism" is a new expression node type CoerceViaIO that can
actually convert between *any* two datatypes if their external text
representations are compatible.  This is more general than needed for the
immediate feature, but might be useful in plpgsql or other places in future.

This commit does nothing about the issue that applying the concatenation
operator || to non-text types will now fail, often with strange error messages
due to misinterpreting the operator as array concatenation.  Since it often
(not always) worked before, we should either make it succeed or at least give
a more user-friendly error; but details are still under debate.

Peter Eisentraut and Tom Lane
This commit is contained in:
Tom Lane
2007-06-05 21:31:09 +00:00
parent 1120b99445
commit 31edbadf4a
60 changed files with 850 additions and 1612 deletions
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9
contrib/isn/isn.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/contrib/isn/isn.h,v 1.3 2007/01/05 22:19:18 momjian Exp $
* $PostgreSQL: pgsql/contrib/isn/isn.h,v 1.4 2007/06/05 21:31:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -38,13 +38,6 @@ extern Datum ismn_in(PG_FUNCTION_ARGS);
extern Datum issn_in(PG_FUNCTION_ARGS);
extern Datum upc_in(PG_FUNCTION_ARGS);
extern Datum ean13_cast_to_text(PG_FUNCTION_ARGS);
extern Datum isn_cast_to_text(PG_FUNCTION_ARGS);
extern Datum ean13_cast_from_text(PG_FUNCTION_ARGS);
extern Datum isbn_cast_from_text(PG_FUNCTION_ARGS);
extern Datum ismn_cast_from_text(PG_FUNCTION_ARGS);
extern Datum issn_cast_from_text(PG_FUNCTION_ARGS);
extern Datum upc_cast_from_text(PG_FUNCTION_ARGS);
extern Datum isbn_cast_from_ean13(PG_FUNCTION_ARGS);
extern Datum ismn_cast_from_ean13(PG_FUNCTION_ARGS);
extern Datum issn_cast_from_ean13(PG_FUNCTION_ARGS);