9 Expression Filter Views

The Expression Filter metadata can be viewed using the Expression Filter views defined with a xxx_EXPFIL prefix, where xxx can be USER or ALL. These views are read-only to the users and are created and maintained by the Expression Filter procedures.

Table 9-1 lists the names of the views and their descriptions.

Table 9-1 Expression Filter Views

View Name	Description
USER_EXPFIL_ASET_FUNCTIONS	List of functions and packages approved for the attribute set.
USER_EXPFIL_ATTRIBUTES	List of elementary attributes of the attribute set.
USER_EXPFIL_ATTRIBUTE_SETS	List of attribute set.
USER_EXPFIL_DEF_INDEX_PARAMS	List of default index parameters.
USER_EXPFIL_EXPRESSION_SETS	List of expression sets.
USER_EXPFIL_EXPRSET_STATS	List of predicate statistics for the expression sets.
USER_EXPFIL_INDEX_PARAMS	List of index parameters assigned to the expression set.
USER_EXPFIL_INDEXES	List of expression filter indexes.
USER_EXPFIL_PREDTAB_ATTRIBUTES	List of stored and indexed attributes for the indexes.
USER_EXPFIL_PRIVILEGES	List of all the expression privileges of the current user.

9.1 USER_EXPFIL_ASET_FUNCTIONS View

This view lists all the functions and packages that are allowed in the expressions using a particular attribute set. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`ATTRIBUTE_SET_NAME`	`VARCHAR2`	Name of the attribute set.
`UDF_NAME`	`VARCHAR2`	Name of the user-defined function or package (or type) as specified by the user (with or without schema extension).
`OBJECT_OWNER`	`VARCHAR2`	Owner of the function or package (or type).
`OBJECT_NAME`	`VARCHAR2`	Name of the function or package (or type).
`OBJECT_TYPE`	`VARCHAR2`	Type of the object at the time the object was added to the attribute set: Function: If the object is a function Package: If the object is a package Type: If the object is a type Embedded type: If the object is a type that is implicitly added to the function list as the type is used by one of the elementary attributes in the set. Synonym: Synonym to a function or package or type.

9.2 USER_EXPFIL_ATTRIBUTES View

This view lists all the elementary attributes of the attribute sets defined in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`ATTRIBUTE_SET_NAME`	`VARCHAR2`	Name of the attribute set.
`ATTRIBUTE`	`VARCHAR2`	Name of the elementary attribute.
`DATA_TYPE`	`VARCHAR2`	Datatype of the attribute.
`ASSOCIATED_TABLE`	`VARCHAR2`	Name of the corresponding table for the table alias attribute. Null for all other types of attributes.

9.3 USER_EXPFIL_ATTRIBUTE_SETS View

This view lists the attribute sets defined in the user's schema. This view is defined with the column described in the following table:

Column Name	Datatype	Description
`ATTRIBUTE_SET_NAME`	`VARCHAR2`	Name of the attribute set.

9.4 USER_EXPFIL_DEF_INDEX_PARAMS View

This view lists the default index parameters (stored and indexed attributes) associated with the attribute sets defined in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`ATTRIBUTE_SET_NAME`	`VARCHAR2`	Name of the attribute set.
`ATTRIBUTE`	`VARCHAR2`	Name of the stored attribute.
`DATA_TYPE`	`VARCHAR2`	Datatype of the attribute.
`ELEMENTARY`	`VARCHAR2`	`YES`, if the attribute is also the elementary attribute of the attribute set; otherwise, `NO`.
`INDEXED`	`VARCHAR2`	`YES`, if the stored attribute is also the indexed attribute; otherwise, `NO`.
`OPERATOR_LIST`	`VARCHAR2`	String representation of the common operators configured for the attribute.
`XMLTYPE_ATTR`	`VARCHAR2`	Name of the corresponding `XMLType` elementary attribute when the stored or indexed attribute is an XML tag.

9.5 USER_EXPFIL_EXPRESSION_SETS View

This view lists the expression sets defined in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`EXPR_TABLE`	`VARCHAR2`	Name of the table storing expressions.
`EXPR_COLUMN`	`VARCHAR2`	Name of the column (in the table) storing expressions.
`ATTRIBUTE_SET`	`VARCHAR2`	Name of the corresponding attribute set.
`LAST_ANALYZED`	`DATE`	Date on which the predicate statistics for this expression set were recently computed. Null if statistics were not collected.
`NUM_EXPRESSIONS`	`NUMBER`	Number of expressions in the set when the set was last analyzed.
`PREDS_PER_EXPR`	`NUMBER`	Average number of predicates for each expression (when last analyzed).
`NUM_SPARSE_PREDS`	`NUMBER`	Number of sparse predicates in the expression set (when last analyzed).

9.6 USER_EXPFIL_EXPRSET_STATS View

This view lists the predicate statistics for the expression sets in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`EXPR_TABLE`	`VARCHAR2`	Name of the table storing expressions.
`EXPR_COLUMN`	`VARCHAR2`	Name of the column (in the table) storing expressions.
`ATTRIBUTE_EXP`	`VARCHAR2`	The arithmetic expression that represents a common LHS in the predicates of the expression set.
`PCT_OCCURRENCE`	`NUMBER`	Percentage occurrence of the attribute in the expression set.
`PCT_EQ_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with equality (=) operator.
`PCT_LT_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the less than (<) operator.
`PCT_GT_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the greater than (>) operator.
`PCT_LTEQ_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the less than or equal to (<=) operator.
`PCT_GTEQ_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the greater than or equal to (>=) operator.
`PCT_NEQ_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the not equal to (!=) operator.
`PCT_NUL_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the `IS` `NULL` operator.
`PCT_NNUL_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the `IS NOT NULL` operator.
`PCT_BETW_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the `BETWEEN` operator.
`PCT_NVL_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the `NVL` operator.
`PCT_LIKE_OPER`	`NUMBER`	Percentage of predicates (of the attribute) with the `LIKE` operator.

9.7 USER_EXPFIL_INDEX_PARAMS View

This view lists the index parameters associated with the expression sets defined in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`EXPSET_TABLE`	`VARCHAR2`	Name of the table storing the expressions.
`EXPSET_COLUMN`	`VARCHAR2`	Name of the column storing the expressions.
`ATTRIBUTE`	`VARCHAR2`	Name of the stored attribute.
`DATA_TYPE`	`VARCHAR2`	Datatype of the attribute.
`ELEMENTARY`	`VARCHAR2`	`YES` if the attribute is also the elementary attribute of the attribute set; otherwise, `NO`.
`INDEXED`	`VARCHAR2`	`YES` if the stored attribute is also the indexed attribute; otherwise, `NO`.
`OPERATOR_LIST`	`VARCHAR2`	String representation of the common operators configured for the attribute.
`XMLTYPE_ATTR`	`VARCHAR2`	Name of the corresponding `XMLType` elementary attribute when the stored or indexed attribute is an XML tag.

9.8 USER_EXPFIL_INDEXES View

This view lists the Expression Filter indexes defined in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`INDEX_NAME`	`VARCHAR2`	Name of the index.
`PREDICATE_TABLE`	`VARCHAR2`	Name of the predicate table used for the index.
`ACCESS_FUNC_PACKAGE`	`VARCHAR2`	Name of the package that defines the functions with queries on the predicate table.
`ATTRIBUTE_SET`	`VARCHAR2`	Name of the corresponding attribute set.
`EXPRESSION_TABLE`	`VARCHAR2`	Name of the table on which the index is defined.
`EXPRESSION_COLUMN`	`VARCHAR2`	Name of the column on which the index is defined.
`STATUS`	`VARCHAR2`	Index status: `VALID`: Index was created successfully. `FAILED`: Index build failed, and it should be dropped and re-created. `FAILED RBLD`: Index build or rebuild failed, and it can be rebuilt using the ALTER INDEX REBUILD statement.

9.9 USER_EXPFIL_PREDTAB_ATTRIBUTES View

This view shows the exact list of stored and indexed attributes used for expression filter indexes in the user's schema. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`INDEX_NAME`	`VARCHAR2`	Name of the index.
`ATTRIBUTE_ID`	`NUMBER`	Attribute identifier (unique for an index).
`ATTRIBUTE_ALIAS`	`VARCHAR2`	Alias given to the stored attribute.
`SUBEXPRESSION`	`VARCHAR2`	The arithmetic expression that represents the stored attribute (also the LHS of predicates in the set).
`DATA_TYPE`	`VARCHAR2`	Derived datatype for the stored attribute.
`INDEXED`	`VARCHAR2`	`YES`, if the stored attribute is also the indexed attribute; otherwise, `NO`.
`OPERATOR_LIST`	`VARCHAR2`	String representation of the common operators configured for the attribute.
`XMLTYPE_ATTR`	`VARCHAR2`	Name of the corresponding `XMLType` elementary attribute when the stored or indexed attribute is an XML tag.
`XPTAG_TYPE`	`VARCHAR2`	Type of the XML tag: `XML ELEMENT or XML ATTRIBUTE`
`XPFILTER_TYPE`	`VARCHAR2`	Type of filter configured for the XML tag: `POSITIONAL` or `[CHAR\|INT\|DATE] VALUE`

9.10 USER_EXPFIL_PRIVILEGES View

This view lists the privileges of the current user on expression sets belonging to other schemas and the privileges of other users on the expression sets owned by the current user. This view is defined with the columns described in the following table:

Column Name	Datatype	Description
`EXPSET_OWNER`	`VARCHAR2`	Owner of the expression set.
`EXPSET_TABLE`	`VARCHAR2`	Name of the table storing expressions.
`EXPSET_COLUMN`	`VARCHAR2`	Name of the column storing the expressions.
`GRANTEE`	`VARCHAR2`	Grantee of the privilege.
`INSERT_PRIV`	`VARCHAR2`	Y if the grantee has the `INSERT EXPRESSION` privilege on the expression set; otherwise, N.
`UPDATE_PRIV`	`VARCHAR2`	Y if the grantee has the `UPDATE EXPRESSION` privilege on the expression set; otherwise, N.