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Allow CHECK constraints to be placed on foreign tables.

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As with NOT NULL constraints, we consider that such constraints are merely
reports of constraints that are being enforced by the remote server (or
other underlying storage mechanism).  Their only real use is to allow
planner optimizations, for example in constraint-exclusion checks.  Thus,
the code changes here amount to little more than removal of the error that
was formerly thrown for applying CHECK to a foreign table.

(In passing, do a bit of cleanup of the ALTER FOREIGN TABLE reference page,
which had accumulated some weird decisions about ordering etc.)

Shigeru Hanada and Etsuro Fujita, reviewed by Kyotaro Horiguchi and
Ashutosh Bapat.
This commit is contained in:
Tom Lane
2014-12-17 17:00:53 -05:00
parent ce01548d4f
commit fc2ac1fb41
11 changed files with 437 additions and 67 deletions
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8
src/backend/commands/tablecmds.c
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@ -479,10 +479,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("ON COMMIT can only be used on temporary tables")));
if (stmt->constraints != NIL && relkind == RELKIND_FOREIGN_TABLE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraints are not supported on foreign tables")));
/*
* Look up the namespace in which we are supposed to create the relation,
@ -3154,7 +3150,7 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
pass = AT_PASS_ADD_INDEX;
break;
case AT_AddConstraint: /* ADD CONSTRAINT */
ATSimplePermissions(rel, ATT_TABLE);
ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
/* Recursion occurs during execution phase */
/* No command-specific prep needed except saving recurse flag */
if (recurse)
@ -3168,7 +3164,7 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
pass = AT_PASS_ADD_CONSTR;
break;
case AT_DropConstraint: /* DROP CONSTRAINT */
ATSimplePermissions(rel, ATT_TABLE);
ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
/* Recursion occurs during execution phase */
/* No command-specific prep needed except saving recurse flag */
if (recurse)