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Add ALTER OPERATOR command, for changing selectivity estimator functions.

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Other options cannot be changed, as it's not totally clear if cached plans
would need to be invalidated if one of the other options change. Selectivity
estimator functions only change plan costs, not correctness of plans, so
those should be safe.

Original patch by Uriy Zhuravlev, heavily edited by me.
This commit is contained in:
Heikki Linnakangas
2015-07-14 18:17:55 +03:00
parent 705d397cd9
commit 321eed5f0f
13 changed files with 499 additions and 65 deletions
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9
src/backend/tcop/utility.c
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@@ -149,6 +149,7 @@ check_xact_readonly(Node *parsetree)
case T_AlterRoleSetStmt:
case T_AlterObjectSchemaStmt:
case T_AlterOwnerStmt:
case T_AlterOperatorStmt:
case T_AlterSeqStmt:
case T_AlterTableMoveAllStmt:
case T_AlterTableStmt:
@@ -1481,6 +1482,10 @@ ProcessUtilitySlow(Node *parsetree,
address = ExecAlterOwnerStmt((AlterOwnerStmt *) parsetree);
break;
case T_AlterOperatorStmt:
address = AlterOperator((AlterOperatorStmt *) parsetree);
break;
case T_CommentStmt:
address = CommentObject((CommentStmt *) parsetree);
break;
@@ -2494,6 +2499,10 @@ CreateCommandTag(Node *parsetree)
tag = "ALTER OPERATOR FAMILY";
break;
case T_AlterOperatorStmt:
tag = "ALTER OPERATOR";
break;
case T_AlterTSDictionaryStmt:
tag = "ALTER TEXT SEARCH DICTIONARY";
break;