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📄 ABORT.7(2.2 KB)
📄 ALTER_AGGREGATE.7(3.53 KB)
📄 ALTER_COLLATION.7(2.8 KB)
📄 ALTER_CONVERSION.7(2.9 KB)
📄 ALTER_DATABASE.7(5.28 KB)
📄 ALTER_DEFAULT_PRIVILEGES.7(6.39 KB)
📄 ALTER_DOMAIN.7(6.79 KB)
📄 ALTER_EXTENSION.7(6.54 KB)
📄 ALTER_FOREIGN_DATA_WRAPPER.7(4.37 KB)
📄 ALTER_FOREIGN_TABLE.7(7.6 KB)
📄 ALTER_FUNCTION.7(7.62 KB)
📄 ALTER_GROUP.7(3 KB)
📄 ALTER_INDEX.7(4.51 KB)
📄 ALTER_LANGUAGE.7(2.1 KB)
📄 ALTER_LARGE_OBJECT.7(1.97 KB)
📄 ALTER_OPERATOR.7(3.01 KB)
📄 ALTER_OPERATOR_CLASS.7(2.85 KB)
📄 ALTER_OPERATOR_FAMILY.7(9.09 KB)
📄 ALTER_ROLE.7(8.23 KB)
📄 ALTER_SCHEMA.7(2.31 KB)
📄 ALTER_SEQUENCE.7(7.52 KB)
📄 ALTER_SERVER.7(3.4 KB)
📄 ALTER_TABLE.7(30.51 KB)
📄 ALTER_TABLESPACE.7(3.27 KB)
📄 ALTER_TEXT_SEARCH_CONFIGURATION.7(4.8 KB)
📄 ALTER_TEXT_SEARCH_DICTIONARY.7(4.03 KB)
📄 ALTER_TEXT_SEARCH_PARSER.7(2.27 KB)
📄 ALTER_TEXT_SEARCH_TEMPLATE.7(2.31 KB)
📄 ALTER_TRIGGER.7(2.51 KB)
📄 ALTER_TYPE.7(6.87 KB)
📄 ALTER_USER.7(2.49 KB)
📄 ALTER_USER_MAPPING.7(3.28 KB)
📄 ALTER_VIEW.7(3.89 KB)
📄 ANALYZE.7(7.52 KB)
📄 BEGIN.7(4.08 KB)
📄 CHECKPOINT.7(2.32 KB)
📄 CLOSE.7(2.76 KB)
📄 CLUSTER.7(6.26 KB)
📄 COMMENT.7(9 KB)
📄 COMMIT.7(2.12 KB)
📄 COMMIT_PREPARED.7(2.61 KB)
📄 COPY.7(26.12 KB)
📄 CREATE_AGGREGATE.7(9.44 KB)
📄 CREATE_CAST.7(14.07 KB)
📄 CREATE_COLLATION.7(4.01 KB)
📄 CREATE_CONVERSION.7(3.82 KB)
📄 CREATE_DATABASE.7(7.86 KB)
📄 CREATE_DOMAIN.7(5.37 KB)
📄 CREATE_EXTENSION.7(5.67 KB)
📄 CREATE_FOREIGN_DATA_WRAPPER.7(5.08 KB)
📄 CREATE_FOREIGN_TABLE.7(4.7 KB)
📄 CREATE_FUNCTION.7(21.62 KB)
📄 CREATE_GROUP.7(2.17 KB)
📄 CREATE_INDEX.7(18.72 KB)
📄 CREATE_LANGUAGE.7(9.86 KB)
📄 CREATE_OPERATOR.7(6.92 KB)
📄 CREATE_OPERATOR_CLASS.7(8.54 KB)
📄 CREATE_OPERATOR_FAMILY.7(3.64 KB)
📄 CREATE_ROLE.7(12.18 KB)
📄 CREATE_RULE.7(7.91 KB)
📄 CREATE_SCHEMA.7(5.4 KB)
📄 CREATE_SEQUENCE.7(9.11 KB)
📄 CREATE_SERVER.7(3.68 KB)
📄 CREATE_TABLE.7(39.83 KB)
📄 CREATE_TABLESPACE.7(3.52 KB)
📄 CREATE_TABLE_AS.7(7.94 KB)
📄 CREATE_TEXT_SEARCH_CONFIGURATION.7(3.25 KB)
📄 CREATE_TEXT_SEARCH_DICTIONARY.7(3.39 KB)
📄 CREATE_TEXT_SEARCH_PARSER.7(3.61 KB)
📄 CREATE_TEXT_SEARCH_TEMPLATE.7(3.43 KB)
📄 CREATE_TRIGGER.7(15.11 KB)
📄 CREATE_TYPE.7(28.33 KB)
📄 CREATE_USER.7(2.48 KB)
📄 CREATE_USER_MAPPING.7(3.31 KB)
📄 CREATE_VIEW.7(7.13 KB)
📄 DEALLOCATE.7(2.05 KB)
📄 DECLARE.7(10.26 KB)
📄 DELETE.7(7.39 KB)
📄 DISCARD.7(2.53 KB)
📄 DO.7(3.13 KB)
📄 DROP_AGGREGATE.7(2.58 KB)
📄 DROP_CAST.7(2.29 KB)
📄 DROP_COLLATION.7(2.34 KB)
📄 DROP_CONVERSION.7(2.4 KB)
📄 DROP_DATABASE.7(2.41 KB)
📄 DROP_DOMAIN.7(2.25 KB)
📄 DROP_EXTENSION.7(2.64 KB)
📄 DROP_FOREIGN_DATA_WRAPPER.7(2.52 KB)
📄 DROP_FOREIGN_TABLE.7(2.5 KB)
📄 DROP_FUNCTION.7(3.27 KB)
📄 DROP_GROUP.7(1.6 KB)
📄 DROP_INDEX.7(2.99 KB)
📄 DROP_LANGUAGE.7(2.77 KB)
📄 DROP_OPERATOR.7(2.9 KB)
📄 DROP_OPERATOR_CLASS.7(3.38 KB)
📄 DROP_OPERATOR_FAMILY.7(3.16 KB)
📄 DROP_OWNED.7(3.02 KB)
📄 DROP_ROLE.7(3.08 KB)
📄 DROP_RULE.7(2.2 KB)
📄 DROP_SCHEMA.7(2.55 KB)
📄 DROP_SEQUENCE.7(2.38 KB)
📄 DROP_SERVER.7(2.3 KB)
📄 DROP_TABLE.7(2.88 KB)
📄 DROP_TABLESPACE.7(2.51 KB)
📄 DROP_TEXT_SEARCH_CONFIGURATION.7(2.76 KB)
📄 DROP_TEXT_SEARCH_DICTIONARY.7(2.67 KB)
📄 DROP_TEXT_SEARCH_PARSER.7(2.58 KB)
📄 DROP_TEXT_SEARCH_TEMPLATE.7(2.61 KB)
📄 DROP_TRIGGER.7(2.52 KB)
📄 DROP_TYPE.7(2.43 KB)
📄 DROP_USER.7(1.68 KB)
📄 DROP_USER_MAPPING.7(2.59 KB)
📄 DROP_VIEW.7(2.34 KB)
📄 END.7(2.21 KB)
📄 EXECUTE.7(2.96 KB)
📄 EXPLAIN.7(12.89 KB)
📄 FETCH.7(8.52 KB)
📄 GRANT.7(21.41 KB)
📄 INSERT.7(8.74 KB)
📄 LISTEN.7(3.53 KB)
📄 LOAD.7(2.58 KB)
📄 LOCK.7(7.92 KB)
📄 MOVE.7(2.96 KB)
📄 NOTIFY.7(7.96 KB)
📄 PREPARE.7(6.2 KB)
📄 PREPARE_TRANSACTION.7(5.77 KB)
📄 REASSIGN_OWNED.7(3.08 KB)
📄 REINDEX.7(7.85 KB)
📄 RELEASE_SAVEPOINT.7(3.06 KB)
📄 RESET.7(2.96 KB)
📄 REVOKE.7(10.46 KB)
📄 ROLLBACK.7(2.12 KB)
📄 ROLLBACK_PREPARED.7(2.64 KB)
📄 ROLLBACK_TO_SAVEPOINT.7(4.01 KB)
📄 SAVEPOINT.7(3.55 KB)
📄 SECURITY_LABEL.7(5.29 KB)
📄 SELECT.7(52.77 KB)
📄 SELECT_INTO.7(4.53 KB)
📄 SET.7(7.46 KB)
📄 SET_CONSTRAINTS.7(4.56 KB)
📄 SET_ROLE.7(4.38 KB)
📄 SET_SESSION_AUTHORIZATION.7(3.92 KB)
📄 SET_TRANSACTION.7(8.44 KB)
📄 SHOW.7(4.25 KB)
📄 START_TRANSACTION.7(2.93 KB)
📄 TABLE.7(18 B)
📄 TRUNCATE.7(6.24 KB)
📄 UNLISTEN.7(2.77 KB)
📄 UPDATE.7(10.63 KB)
📄 VACUUM.7(7.09 KB)
📄 VALUES.7(6.97 KB)
📄 WITH.7(18 B)

Editing: CREATE_OPERATOR_CLASS.7

'\" t
.\"     Title: CREATE OPERATOR CLASS
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 2017-11-06
.\"    Manual: PostgreSQL 9.2.24 Documentation
.\"    Source: PostgreSQL 9.2.24
.\"  Language: English
.\"
.TH "CREATE OPERATOR CLASS" "7" "2017-11-06" "PostgreSQL 9.2.24" "PostgreSQL 9.2.24 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
CREATE_OPERATOR_CLASS \- define a new operator class
.\" CREATE OPERATOR CLASS
.SH "SYNOPSIS"
.sp
.nf
CREATE OPERATOR CLASS \fIname\fR [ DEFAULT ] FOR TYPE \fIdata_type\fR
  USING \fIindex_method\fR [ FAMILY \fIfamily_name\fR ] AS
  {  OPERATOR \fIstrategy_number\fR \fIoperator_name\fR [ ( \fIop_type\fR, \fIop_type\fR ) ] [ FOR SEARCH | FOR ORDER BY \fIsort_family_name\fR ]
   | FUNCTION \fIsupport_number\fR [ ( \fIop_type\fR [ , \fIop_type\fR ] ) ] \fIfunction_name\fR ( \fIargument_type\fR [, \&.\&.\&.] )
   | STORAGE \fIstorage_type\fR
  } [, \&.\&.\&. ]
.fi
.SH "DESCRIPTION"
.PP
\fBCREATE OPERATOR CLASS\fR
creates a new operator class\&. An operator class defines how a particular data type can be used with an index\&. The operator class specifies that certain operators will fill particular roles or
\(lqstrategies\(rq
for this data type and this index method\&. The operator 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 can be created\&.
.PP
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\&.
.PP
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\&.)
.PP
\fBCREATE OPERATOR CLASS\fR
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\*(Aqs responsibility to define a valid operator class\&.
.PP
Related operator classes can be grouped into
operator families\&. To add a new operator class to an existing family, specify the
FAMILY
option in
\fBCREATE OPERATOR CLASS\fR\&. Without this option, the new class is placed into a family named the same as the new class (creating that family if it doesn\*(Aqt already exist)\&.
.PP
Refer to
Section 35.14, \(lqInterfacing Extensions To Indexes\(rq, in the documentation
for further information\&.
.SH "PARAMETERS"
.PP
\fIname\fR
.RS 4
The name of the operator class to be created\&. The name can be schema\-qualified\&.
.RE
.PP
DEFAULT
.RS 4
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\&.
.RE
.PP
\fIdata_type\fR
.RS 4
The column data type that this operator class is for\&.
.RE
.PP
\fIindex_method\fR
.RS 4
The name of the index method this operator class is for\&.
.RE
.PP
\fIfamily_name\fR
.RS 4
The name of the existing operator family to add this operator class to\&. If not specified, a family named the same as the operator class is used (creating it, if it doesn\*(Aqt already exist)\&.
.RE
.PP
\fIstrategy_number\fR
.RS 4
The index method\*(Aqs strategy number for an operator associated with the operator class\&.
.RE
.PP
\fIoperator_name\fR
.RS 4
The name (optionally schema\-qualified) of an operator associated with the operator class\&.
.RE
.PP
\fIop_type\fR
.RS 4
In an
OPERATOR
clause, the operand data type(s) of the operator, or
NONE
to signify a left\-unary or right\-unary operator\&. The operand data types can be omitted in the normal case where they are the same as the operator class\*(Aqs data type\&.
.sp
In a
FUNCTION
clause, the operand data type(s) the function is intended to support, if different from the input data type(s) of the function (for B\-tree comparison functions and hash functions) or the class\*(Aqs data type (for B\-tree sort support functions and all functions in GiST, SP\-GiST and GIN operator classes)\&. These defaults are correct, and so
\fIop_type\fR
need not be specified in
FUNCTION
clauses, except for the case of a B\-tree sort support function that is meant to support cross\-data\-type comparisons\&.
.RE
.PP
\fIsort_family_name\fR
.RS 4
The name (optionally schema\-qualified) of an existing
btree
operator family that describes the sort ordering associated with an ordering operator\&.
.sp
If neither
FOR SEARCH
nor
FOR ORDER BY
is specified,
FOR SEARCH
is the default\&.
.RE
.PP
\fIsupport_number\fR
.RS 4
The index method\*(Aqs support procedure number for a function associated with the operator class\&.
.RE
.PP
\fIfunction_name\fR
.RS 4
The name (optionally schema\-qualified) of a function that is an index method support procedure for the operator class\&.
.RE
.PP
\fIargument_type\fR
.RS 4
The parameter data type(s) of the function\&.
.RE
.PP
\fIstorage_type\fR
.RS 4
The data type actually stored in the index\&. Normally this is the same as the column data type, but some index methods (currently GiST and GIN) allow it to be different\&. The
STORAGE
clause must be omitted unless the index method allows a different type to be used\&.
.RE
.PP
The
OPERATOR,
FUNCTION, and
STORAGE
clauses can appear in any order\&.
.SH "NOTES"
.PP
Because the index machinery does not check access permissions on functions before using them, including a function or operator in an operator 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\&.
.PP
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\&.
.PP
Before
PostgreSQL
8\&.4, the
OPERATOR
clause could include a
RECHECK
option\&. This is no longer supported because whether an index operator is
\(lqlossy\(rq
is now determined on\-the\-fly at run time\&. This allows efficient handling of cases where an operator might or might not be lossy\&.
.SH "EXAMPLES"
.PP
The following example command defines a GiST index operator class for the data type
_int4
(array of
int4)\&. See the
intarray
module for the complete example\&.
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE OPERATOR CLASS gist__int_ops
    DEFAULT FOR TYPE _int4 USING gist AS
        OPERATOR        3       &&,
        OPERATOR        6       = (anyarray, anyarray),
        OPERATOR        7       @>,
        OPERATOR        8       <@,
        OPERATOR        20      @@ (_int4, query_int),
        FUNCTION        1       g_int_consistent (internal, _int4, int, oid, internal),
        FUNCTION        2       g_int_union (internal, 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);
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
\fBCREATE OPERATOR CLASS\fR
is a
PostgreSQL
extension\&. There is no
\fBCREATE OPERATOR CLASS\fR
statement in the SQL standard\&.
.SH "SEE ALSO"
ALTER OPERATOR CLASS (\fBALTER_OPERATOR_CLASS\fR(7)), DROP OPERATOR CLASS (\fBDROP_OPERATOR_CLASS\fR(7)), CREATE OPERATOR FAMILY (\fBCREATE_OPERATOR_FAMILY\fR(7)), ALTER OPERATOR FAMILY (\fBALTER_OPERATOR_FAMILY\fR(7))

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