The attached patch extends Peter's proposed patch to upgrade most implicit casts-to-text to be assignment casts: http://archives.postgresql.org/pgsql-hackers/2007-04/msg00017.php with the other stuff discussed subsequently in that thread, namely creating a generalized facility to support casts to and from text (and varchar and bpchar) via the basic I/O functions of other types.
This adds one expression node type ("CoerceViaIO") but allows elimination of a veritable boatload of duplicative per-datatype text conversion functions, plus it works for types that never had such functions. I have not touched the documentation yet. Also I just noticed that contrib/cube and contrib/isn create text casts that could be dispensed with. I think the patch is complete otherwise. Another point that needs to be dealt with is the infelicity discussed here: http://archives.postgresql.org/pgsql-hackers/2007-02/msg01729.php We had pretty much agreed that we could handle that by restricting the conditions under which we'd consider coercing an UNKNOWN literal to ANYARRAY, but it wasn't quite clear *what* restriction to use. Comments? regards, tom lane
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