create_operator_class man page on UnixWare

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       CREATE OPERATOR CLASS - define a new operator class

       CREATE OPERATOR CLASS name [ DEFAULT ] FOR TYPE data_type USING index_method AS
	 {  OPERATOR strategy_number operator_name [ ( op_type, op_type ) ] [ RECHECK ]
	  | FUNCTION support_number funcname ( argument_type [, ...] )
	  | STORAGE storage_type
	 } [, ... ]

       CREATE  OPERATOR CLASS creates a new operator class.  An operator class
       defines how a particular data type can be used with an index. The oper‐
       ator  class specifies that certain operators will fill particular roles
       or ``strategies'' for this data type and this index method. The	opera‐
       tor class also specifies the support procedures to be used by the index
       method when the operator class is selected for an index column. All the
       operators  and  functions  used	by  an	operator class must be defined
       before the operator class is created.

       If a schema name is given then the operator class  is  created  in  the
       specified  schema.  Otherwise it is created in the current schema.  Two
       operator classes in the same schema can have the same name only if they
       are for different index methods.

       The  user  who  defines an operator class becomes its owner. Presently,
       the creating user must  be  a  superuser.  (This	 restriction  is  made
       because	an  erroneous  operator class definition could confuse or even
       crash the server.)

       CREATE OPERATOR CLASS does not presently	 check	whether	 the  operator
       class  definition  includes all the operators and functions required by
       the index method, nor whether the operators and functions form a	 self-
       consistent set. It is the user's responsibility to define a valid oper‐
       ator class.

       Refer to in the documentation for further information.

       name   The name of the operator class to be created. The	 name  may  be

	      If  present, the operator class will become the default operator
	      class for its data type. At most one operator class can  be  the
	      default for a specific data type and index method.

	      The column data type that this operator class is for.

	      The name of the index method this operator class is for.

	      The  index  method's  strategy number for an operator associated
	      with the operator class.

	      The name (optionally schema-qualified) of an operator associated
	      with the operator class.

	      The  operand  data  type(s) of an operator, or NONE to signify a
	      left-unary or right-unary operator. The operand data  types  may
	      be  omitted  in  the  normal case where they are the same as the
	      operator class's data type.

	      If present, the index is ``lossy'' for this operator, and so the
	      rows  retrieved using the index must be rechecked to verify that
	      they actually satisfy the qualification  clause  involving  this

	      The index method's support procedure number for a function asso‐
	      ciated with the operator class.

	      The name (optionally schema-qualified) of a function that is  an
	      index method support procedure for the operator class.

	      The parameter data type(s) of the function.

	      The data type actually stored in the index. Normally this is the
	      same as the column data type, but some index  methods  (GIN  and
	      GiST  for now) allow it to be different. The STORAGE clause must
	      be omitted unless the index method allows a different type to be

       The OPERATOR, FUNCTION, and STORAGE clauses may appear in any order.

       Because	the index machinery does not check access permissions on func‐
       tions before using them, including a function or operator in an	opera‐
       tor  class  is  tantamount to granting public execute permission on it.
       This is usually not an issue for the sorts of functions that are useful
       in an operator class.

       The operators should not be defined by SQL functions. A SQL function is
       likely to be inlined into the calling query,  which  will  prevent  the
       optimizer from recognizing that the query matches an index.

       The  following  example command defines a GiST index operator class for
       the data type _int4 (array of int4). See contrib/intarray/ for the com‐
       plete example.

       CREATE OPERATOR CLASS gist__int_ops
	       OPERATOR	       3       &&,
	       OPERATOR	       6       =       RECHECK,
	       OPERATOR	       7       @>,
	       OPERATOR	       8       <@,
	       OPERATOR	       20      @@ (_int4, query_int),
	       FUNCTION	       1       g_int_consistent (internal, _int4, int4),
	       FUNCTION	       2       g_int_union (bytea, internal),
	       FUNCTION	       3       g_int_compress (internal),
	       FUNCTION	       4       g_int_decompress (internal),
	       FUNCTION	       5       g_int_penalty (internal, internal, internal),
	       FUNCTION	       6       g_int_picksplit (internal, internal),
	       FUNCTION	       7       g_int_same (_int4, _int4, internal);

       CREATE  OPERATOR	 CLASS	is  a PostgreSQL extension. There is no CREATE
       OPERATOR CLASS statement in the SQL standard.

       ALTER OPERATOR CLASS  [alter_operator_class(5)],	 DROP  OPERATOR	 CLASS

SQL - Language Statements	  2008-01-03	       CREATE OPERATOR CLASS()
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