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Remove transformAlterTableStmt's kluge to replace ColumnDef.is_not_null

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flags by separate AT_SetNotNull subcommands.  That was always ugly and
inefficient, and it's now clear that it was merely a partial workaround
for the bug just identified in ATExecAddColumn.  This is just code
beautification not a bug fix, so no back-patch.

Brendan Jurd, with some trivial additional cleanup by me.
This commit is contained in:
Tom Lane 2008-04-24 20:46:49 +00:00
parent bb908d9879
commit 46e9709f48
1 changed files with 5 additions and 24 deletions
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29
src/backend/parser/parse_utilcmd.c
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@ -19,7 +19,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/parser/parse_utilcmd.c,v 2.11 2008/03/25 22:42:43 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_utilcmd.c,v 2.12 2008/04/24 20:46:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1718,41 +1718,23 @@ transformAlterTableStmt(AlterTableStmt *stmt, const char *queryString)
{
ColumnDef *def = (ColumnDef *) cmd->def;
Assert(IsA(cmd->def, ColumnDef));
transformColumnDefinition(pstate, &cxt,
(ColumnDef *) cmd->def);
Assert(IsA(def, ColumnDef));
transformColumnDefinition(pstate, &cxt, def);
/*
* If the column has a non-null default, we can't skip
* validation of foreign keys.
*/
if (((ColumnDef *) cmd->def)->raw_default != NULL)
if (def->raw_default != NULL)
skipValidation = false;
newcmds = lappend(newcmds, cmd);
/*
* Convert an ADD COLUMN ... NOT NULL constraint to a
* separate command
*/
if (def->is_not_null)
{
/* Remove NOT NULL from AddColumn */
def->is_not_null = false;
/* Add as a separate AlterTableCmd */
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = AT_SetNotNull;
newcmd->name = pstrdup(def->colname);
newcmds = lappend(newcmds, newcmd);
}
/*
* All constraints are processed in other ways. Remove the
* original list
*/
def->constraints = NIL;
newcmds = lappend(newcmds, cmd);
break;
}
case AT_AddConstraint:
@ -1760,7 +1742,6 @@ transformAlterTableStmt(AlterTableStmt *stmt, const char *queryString)
/*
* The original AddConstraint cmd node doesn't go to newcmds
*/
if (IsA(cmd->def, Constraint))
transformTableConstraint(pstate, &cxt,
(Constraint *) cmd->def);