## ALTER OPERATOR

ALTER OPERATOR — change the definition of an operator

## Synopsis

```
ALTER OPERATOR name ( { left_type | NONE } , right_type )
    OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }

ALTER OPERATOR name ( { left_type | NONE } , right_type )
    SET SCHEMA new_schema

ALTER OPERATOR name ( { left_type | NONE } , right_type )
    SET ( {  RESTRICT = { res_proc | NONE }
           | JOIN = { join_proc | NONE }
         } [, ... ] )

```

## Description

`ALTER OPERATOR` changes the definition of an operator.

 You must own the operator to use `ALTER OPERATOR`. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have `CREATE` privilege on the operator's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the operator. However, a superuser can alter ownership of any operator anyway.)

## Parameters

*`name`*

 The name (optionally schema-qualified) of an existing operator.

*`left_type`*

 The data type of the operator's left operand; write `NONE` if the operator has no left operand.

*`right_type`*

 The data type of the operator's right operand.

*`new_owner`*

 The new owner of the operator.

*`new_schema`*

 The new schema for the operator.

*`res_proc`*

 The restriction selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.

*`join_proc`*

 The join selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.

## Examples

 Change the owner of a custom operator `a @@ b` for type `text`:

```
ALTER OPERATOR @@ (text, text) OWNER TO joe;

```

 Change the restriction and join selectivity estimator functions of a custom operator `a && b` for type `int[]`:

```
ALTER OPERATOR && (_int4, _int4) SET (RESTRICT = _int_contsel, JOIN = _int_contjoinsel);

```

## Compatibility

 There is no `ALTER OPERATOR` statement in the SQL standard.

## See Also

[CREATE OPERATOR](sql-createoperator.html), [DROP OPERATOR](sql-dropoperator.html)

