database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-28 23:42:10 +03:00
Code Activity

Trial implementation of ALTER DROP COLUMN.

Browse Source 
They are #ifdef'd.
Add -D_DROP_COLUMN_HACK__ compile option
to evaluate it.
This commit is contained in:
Hiroshi Inoue
2000-03-09 05:00:26 +00:00
parent 6513946cbb
commit fd9ff86bd9
8 changed files with 514 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
src/backend/optimizer/prep/preptlist.c
View File

@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/preptlist.c,v 1.34 2000/01/26 05:56:39 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/preptlist.c,v 1.35 2000/03/09 05:00:24 inoue Exp $
*
*-------------------------------------------------------------------------
*/
@ -189,10 +189,20 @@ expand_targetlist(List *tlist, int command_type,
{
case CMD_INSERT:
{
#ifdef _DROP_COLUMN_HACK__
Datum typedefault;
#else
Datum typedefault = get_typdefault(atttype);
#endif /* _DROP_COLUMN_HACK__ */
int typlen;
Const *temp_const;
#ifdef _DROP_COLUMN_HACK__
if (COLUMN_IS_DROPPED(att_tup))
typedefault = PointerGetDatum(NULL);
else
typedefault = get_typdefault(atttype);
#endif /* _DROP_COLUMN_HACK__ */
if (typedefault == PointerGetDatum(NULL))
typlen = 0;
else
@ -230,8 +240,25 @@ expand_targetlist(List *tlist, int command_type,
{
Var *temp_var;
#ifdef _DROP_COLUMN_HACK__
Node *temp_node = (Node *) NULL;
if (COLUMN_IS_DROPPED(att_tup))
{
temp_node = (Node *)makeConst(atttype, 0,
PointerGetDatum(NULL),
true,
false,
false, /* not a set */
false);
}
else
#endif /* _DROP_COLUMN_HACK__ */
temp_var = makeVar(result_relation, attrno, atttype,
atttypmod, 0);
#ifdef _DROP_COLUMN_HACK__
if (!temp_node)
temp_node = (Node *) temp_var;
#endif /* _DROP_COLUMN_HACK__ */
new_tle = makeTargetEntry(makeResdom(attrno,
atttype,
@ -239,8 +266,12 @@ expand_targetlist(List *tlist, int command_type,
pstrdup(attrname),
0,
(Oid) 0,
false),
(Node *) temp_var);
false),
#ifdef _DROP_COLUMN_HACK__
temp_node);
#else
(Node *) temp_var);
#endif /* _DROP_COLUMN_HACK__ */
break;
}
default: