diff options
Diffstat (limited to 'src/backend/commands/tablecmds.c')
| -rw-r--r-- | src/backend/commands/tablecmds.c | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 7588b422a3a..becbe19627b 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -291,11 +291,11 @@ static void ATExecAddIndex(AlteredTableInfo *tab, Relation rel, IndexStmt *stmt, bool is_rebuild); static void ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, - Node *newConstraint, bool recurse); + Node *newConstraint, bool recurse, bool is_readd); static void ATAddCheckConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, Constraint *constr, - bool recurse, bool recursing); + bool recurse, bool recursing, bool is_readd); static void ATAddForeignKeyConstraint(AlteredTableInfo *tab, Relation rel, FkConstraint *fkconstraint); static void ATExecDropConstraint(Relation rel, const char *constrName, @@ -2559,10 +2559,13 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel, ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, true); break; case AT_AddConstraint: /* ADD CONSTRAINT */ - ATExecAddConstraint(wqueue, tab, rel, cmd->def, false); + ATExecAddConstraint(wqueue, tab, rel, cmd->def, false, false); break; case AT_AddConstraintRecurse: /* ADD CONSTRAINT with recursion */ - ATExecAddConstraint(wqueue, tab, rel, cmd->def, true); + ATExecAddConstraint(wqueue, tab, rel, cmd->def, true, false); + break; + case AT_ReAddConstraint: /* Re-add pre-existing check constraint */ + ATExecAddConstraint(wqueue, tab, rel, cmd->def, false, true); break; case AT_DropConstraint: /* DROP CONSTRAINT */ ATExecDropConstraint(rel, cmd->name, cmd->behavior, false, false); @@ -4309,7 +4312,7 @@ ATExecAddIndex(AlteredTableInfo *tab, Relation rel, */ static void ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, - Node *newConstraint, bool recurse) + Node *newConstraint, bool recurse, bool is_readd) { switch (nodeTag(newConstraint)) { @@ -4327,7 +4330,7 @@ ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, { case CONSTR_CHECK: ATAddCheckConstraint(wqueue, tab, rel, - constr, recurse, false); + constr, recurse, false, is_readd); break; default: elog(ERROR, "unrecognized constraint type: %d", @@ -4387,10 +4390,18 @@ ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, * AddRelationNewConstraints would normally assign different names to the * child constraints. To fix that, we must capture the name assigned at * the parent table and pass that down. + * + * When re-adding a previously existing constraint (during ALTER COLUMN TYPE), + * we don't need to recurse here, because recursion will be carried out at a + * higher level; the constraint name issue doesn't apply because the names + * have already been assigned and are just being re-used. We need a separate + * "is_readd" flag for that; just setting recurse=false would result in an + * error if there are child tables. */ static void ATAddCheckConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, - Constraint *constr, bool recurse, bool recursing) + Constraint *constr, bool recurse, bool recursing, + bool is_readd) { List *newcons; ListCell *lcon; @@ -4450,6 +4461,13 @@ ATAddCheckConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, return; /* + * Also, in a re-add operation, we don't need to recurse (that will be + * handled at higher levels). + */ + if (is_readd) + return; + + /* * Propagate to children as appropriate. Unlike most other ALTER * routines, we have to do this one level of recursion at a time; we can't * use find_all_inheritors to do it in one pass. @@ -4481,7 +4499,7 @@ ATAddCheckConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel, /* Recurse to child */ ATAddCheckConstraint(wqueue, childtab, childrel, - constr, recurse, true); + constr, recurse, true, is_readd); heap_close(childrel, NoLock); } @@ -6057,6 +6075,10 @@ ATPostAlterTypeParse(char *cmd, List **wqueue) /* * Attach each generated command to the proper place in the work queue. * Note this could result in creation of entirely new work-queue entries. + * + * Also note that we have to tweak the command subtypes, because it turns + * out that re-creation of indexes and constraints has to act a bit + * differently from initial creation. */ foreach(list_item, querytree_list) { @@ -6100,6 +6122,7 @@ ATPostAlterTypeParse(char *cmd, List **wqueue) lappend(tab->subcmds[AT_PASS_OLD_INDEX], cmd); break; case AT_AddConstraint: + cmd->subtype = AT_ReAddConstraint; tab->subcmds[AT_PASS_OLD_CONSTR] = lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd); break; |