const char *colName, LOCKMODE lockmode)

{

HeapTupletuple;

Form_pg_attribute attTup;

AttrNumberattnum;

Relationattr_rel;

ObjectAddress address;

errmsg("column \"%s\" of relation \"%s\" does not exist",

colName, RelationGetRelationName(rel))));

attnum = ((Form_pg_attribute) GETSTRUCT(tuple))->attnum;

attTup = (Form_pg_attribute) GETSTRUCT(tuple);

attnum = attTup->attnum;

/* Prevent them from altering a system attribute */

if (attnum <= 0)

/*

* Okay, actually perform the catalog change ... if needed

*/

if (!((Form_pg_attribute) GETSTRUCT(tuple))->attnotnull)

if (!attTup->attnotnull)

{

((Form_pg_attribute) GETSTRUCT(tuple))->attnotnull = true;

attTup->attnotnull = true;

CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);

* this then we can skip that. We needn't bother looking if we've

* already found that we must verify some other not-null constraint.

*/

if (!tab->verify_new_notnull &&

!NotNullImpliedByRelConstraints(rel, (Form_pg_attribute) GETSTRUCT(tuple)))

if (!tab->verify_new_notnull && !NotNullImpliedByRelConstraints(rel, attTup))

{

/* Tell Phase 3 it needs to test the constraint */

tab->verify_new_notnull = true;