18 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 18-1 lists the names of the views and their descriptions.

Table 18-1 Expression Filter Views

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

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	Data Type	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 the 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

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	Data Type	Description
ATTRIBUTE_SET_NAME	VARCHAR2	Name of the attribute set.
ATTRIBUTE	VARCHAR2	Name of the elementary attribute.
DATA_TYPE	VARCHAR2	Data type of the attribute.
ASSOCIATED_TABLE	VARCHAR2	Name of the corresponding table for the table alias attribute. Null for all other types of attributes.

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	Data Type	Description
ATTRIBUTE_SET_NAME	VARCHAR2	Name of the attribute set

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	Data Type	Description
ATTRIBUTE_SET_NAME	VARCHAR2	Name of the attribute set
ATTRIBUTE	VARCHAR2	Name of the stored attribute
DATA_TYPE	VARCHAR2	Data type 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

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	Data Type	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)

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	Data Type	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 left-hand side (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

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	Data Type	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	Data type 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

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	Data Type	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

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	Data Type	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 data type 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`

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	Data Type	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`