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Coerce unknown-literal-constant default values to the column type during

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CREATE TABLE (or ALTER TABLE SET DEFAULT), rather than postponing it to
the time that the default is inserted into an INSERT command by the
rewriter.  This reverses an old decision that was intended to make the
world safe for writing
	f1 timestamp default 'now'
but in fact merely made the failure modes subtle rather than obvious.
Per recent trouble report and followup discussion.

initdb forced since there is a chance that stored default expressions
will change.
This commit is contained in:
Tom Lane
2003-07-29 17:21:27 +00:00
parent f353f8e83b
commit 5e3c09a114
3 changed files with 21 additions and 29 deletions
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15
src/backend/rewrite/rewriteHandler.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.124 2003/07/25 00:01:08 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.125 2003/07/29 17:21:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -538,10 +538,11 @@ build_column_default(Relation rel, int attrno)
return NULL; /* No default anywhere */
/*
* Make sure the value is coerced to the target column type (might not
* be right type yet if it's not a constant!) This should match the
* parser's processing of non-defaulted expressions --- see
* updateTargetListEntry().
* Make sure the value is coerced to the target column type; this will
* generally be true already, but there seem to be some corner cases
* involving domain defaults where it might not be true.
* This should match the parser's processing of non-defaulted expressions
* --- see updateTargetListEntry().
*/
exprtype = exprType(expr);
@ -550,10 +551,6 @@ build_column_default(Relation rel, int attrno)
atttype, atttypmod,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST);
/*
* This really shouldn't fail; should have checked the default's
* type when it was created ...
*/
if (expr == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),