19 Extensibility Constants, Types, and Mappings

This chapter describes System Defined Constants and System Defined Types, which apply generically to all supported languages. It also describes mappings that are specific to the PL/SQL, C, and Java languages.

This chapter contains these topics:

System Defined Constants
System-Defined Types
Mappings of Constants and Types

System Defined Constants

All the constants referred to in this chapter are defined in the ODCIConst package installed as part of the catodci.sql script. There are equivalent definitions for use within C routines in odci.h. You should use these constants instead of hard coding their underlying values in your routines. To ensure that the database or packet state are not inadvertently corrupted, the following statement is always used with these methods to restrict reads and writes:

pragma restrict_references(ODCIConst, WNDS, RNDS, WNPS, RNPS);

The options described in this section fall into two categories:

Bit-field values that can be combined using the OR operator are: ODCIIndexAlter options (Table 19-1), ODCIIndexInfo flag bits (Table 19-4), ODCIPredInfo flag bits (Table 19-5), ODICI FuncInfo flag bits(Table 19-6), ODCIQueryInfo flag bits (Table 19-7), ODCIStatsOptions flag bits (Table 19-8), and ODCIStatsOptions option bits (Table 19-9).
Distinct values, where only one option can be specified, are: ODCIArgDesc ArgType values (Table 19-2), ODCIEnv CallProperty values (Table 19-3), ScnFlg values (Table 19-10), and ReturnStatus values (Table 19-11)

Table 19-1 ODCIIndexAlter Options

Name	Description
AlterIndexNone	Default option
AlterIndexRename	Rename Partition option
AlterIndexRebuild	Rebuild Index option
AlterIndexUpdBlockRefs	IOT Update Block References Option

Table 19-2 ODCIArgDesc.ArgType Values

Name	Description
ArgOther	Argument is other expression
ArgCol	Argument is a column name
ArgLit	Argument is a literal value
ArgAttr	Argument is an ADT `attr` column
ArgCursor	Argument is a `CURSOR` expression
ArgNull	Argument is `NULL`

Table 19-3 ODCIEnv.CallProperty Values

Name	Description
None	Default option
FirstCall	First partition call
Intermediate Call	Intermediate partition call
FinalCall	Final call after last partition

Table 19-4 ODCIIndexInfo.Flags Bits

Name	Description
Local	Indicates a local domain index
RangePartn	For a local domain index, indicates that the base table is range-partitioned. Is set only in conjunction with the `Local` bit
Parallel	Indicates that a parallel degree was specified for the index creation or alter operation
Unusable	Indicates that `UNUSABLE` was specified during index creation and that the index being created will be marked unusable
IndexOnIOT	Indicates that the domain index is defined on an index-organized table
TransTblspc	Indicates that the domain index is created in a transportable tablespace session.
FunctionIdx	Indicates that the index is a function-based domain index

Table 19-5 ODCIIPredInfo.Flags Bits

Name	Description
PredExactMatch	Equality predicate
PredPrefixMatch	`LIKE` predicate
PredIncludeStart	Include start value in index range scan
PredIncludeStop	Include stop value in index range scan
PredObjectFunc	Left hand side of predicate is a standalone function
PredObjectPkg	Left hand side of predicate is a package function
PredObjectType	Left hand site of predicate is a type method
PredObjectTable	Predicate contains columns from more than one table

Table 19-6 ODCIFuncInfo.Flags Bits

Name	Description
ObjectFunc	Standalone function
ObjectPkg	Package function
ObjectType	Type method

Table 19-7 ODCIQueryInfo.Flags Bits

Name	Description
QueryFirstRows	Optimizer mode is `FIRST_ROWS`
QueryAllRows	Optimizer mode is `ALL_ROWS`

Table 19-8 ODCIStatsOptions.Flags Bits

Name	Description
EstimateStats	Estimate statistics option
ComputeStats	Compute exact statistics option
Validate	Validate index option

Table 19-9 ODCIStatsOptions.Options Bits

Name	Description
PercentOption	Compute statistics by sampling
RowOption	Compute statistics based on all rows

Table 19-10 ScnFlg Values; Function with Index Context

Name	Description
RegularCall	User defined operator regular call
CleanupCall	User defined operator cleanup call

Table 19-11 Return Status Values

Name	Description
Success	Indicates a successful operation.
Error	Indicates an error.

System-Defined Types

A number of system-defined types are defined by Oracle and need to be created by running the catodci.sql catalog script. The C mappings for these object types are defined in odci.h. The ODCIIndex and ODCIStats routines described in Chapter 20 and Chapter 21 use these types as parameters.

Unless otherwise mentioned, the names parsed as type attributes are unquoted identifiers.

ODCIArgDesc

Object type. Stores function or operator arguments.

Table 19-12 DCIArgDesc Function/Operator Argument Description - Attributes

Name	Datatype	Description
ArgType	NUMBER	Argument type
TableName	VARCHAR2(30)	Name of table
TableSchema	VARCHAR2(30)	Schema containing the table
ColName	VARCHAR2(4000)	Name of column. This could be top level column name such as "A", or a nested column "A"."B" Note that the column name are quoted identifiers.
TablePartitionLower	VARCHAR2(30)	Contains the name of the lowest table partition that is accessed in the query
TablePartitionUpper	VARCHAR2(30)	Contains the name of the highest table partition that is accessed in the query
Cardinality	NUMBER	Cardinality value for `CURSOR` expressions

ODCIArgDescList

Contains a list of argument descriptors

Datatype

VARRAY(32767) of ODCIArgDesc

ODCIRidList

Stores list of rowids. The rowids are stored in their character format.

Datatype

VARRAY(32767) OF VARCHAR2("M_URID_SZ")

ODCIColInfo

Stores column related information.

Datatype

Object type.

Table 19-13 ODCIColInfo Column Related Information - Attributes

Name	Datatype	Purpose
TableSchema	VARCHAR2(30)	Schema containing table
TableName	VARCHAR2(30)	Name of table
ColName	VARCHAR2(4000)	Name of column. This could be top level column name such as "A", or a nested column "A"."B" Note that the column name are quoted identifiers.
ColTypeName	VARCHAR2(30)	Datatype of column
ColTypeSchema	VARCHAR2(30)	Schema containing datatype if user-defined datatype
TablePartition	VARCHAR2(30)	For a local domain index, contains the name of the specific base table partition

ODCIColInfoList

Stores information related to a list of columns.

Datatype

VARRAY(32) OF ODCIColInfo

ODCICost

Object type. Stores cost information.

Table 19-14 ODCICost Cost Information - Attributes

Name	Datatype	Purpose
CPUCost	NUMBER	CPU cost
IOCost	NUMBER	I/O cost
NetworkCost	NUMBER	Communication cost
IndexCostInfo	VARCHAR2(255)	Optional user-supplied information about the domain index for display in the `PLAN` table (255 characters maximum)

ODCIEnv

Object type. Contains general information about the environment in which the extensibility routines are executing.

Table 19-15 ODCIEnv Environment Variable Descriptor Information - Attributes

Name	Datatype	Purpose
`EnvFlags`	`NUMBER`	1 = Debugging On
`CallProperty`	`NUMBER`	0 = None 1 = First Call 2 = Intermediate Call 3 = Final Call
`DebugLevel`	`NUMBER`	Indicates the level of debugging

Usage Notes

CallProperty is used only for local domain indexes. For non-local domain indexes it is always set to 0. For local domain indexes, CallProperty is set to indicate which is the current call in cases where multiple calls are made to the same routine.

For example, when creating a local domain index, the ODCIIndexCreate routine is called n+2 times, where n is the number of partitions. For the first call, CallProperty is set to FirstCall, for the n intermediate calls, it is set to IntermediateCall, and for the last call it is set to FinalCall.

CallProperty is used only for CREATE INDEX, DROP INDEX, TRUNCATE TABLE, and for some of the extensible optimizer-related calls for local domain indexes. In all other cases, including DML and query routines for local domain indexes, it is set to 0.

ODCIFuncInfo

Object type. Stores functional information.

Table 19-16 ODCIFuncInfo Function Information - Attributes

Name	Datatype	Purpose
ObjectSchema	VARCHAR2(30)	Object schema name
ObjectName	VARCHAR2(30)	Function/package/type name
MethodName	VARCHAR2(30)	Method name for package/type
Flags	NUMBER	Function flags - see `ODCIConst`

ODCIIndexInfo

Object type. Stores the metadata information related to a domain index. It is passed as a parameter to all ODCIIndex routines.

Table 19-17 ODCIIndexInfo Index Related Information - Attributes

Name	Datatype	Purpose
IndexSchema	VARCHAR2(30)	Schema containing domain index
IndexName	VARCHAR2(30)	Name of domain index
IndexCols	ODCIColInfoList	List of indexed columns
IndexPartition	VARCHAR2(30)	For a local domain index, contains the name of the specific index partition
IndexInfoFlags	NUMBER	Possible flags are: `Local` `RangePartn` `Parallel` `Unusable` `IndexOnIOT` `TransTblspc` `FunctionIdx`
IndexParaDegree	NUMBER	The degree of parallelism, if one is specified when creating or rebuilding a domain index or local domain index partition in parallel

ODCIPredInfo

Object type. Stores the metadata information related to a predicate containing a user-defined operator or function. It is also passed as a parameter to the ODCIIndexStart() query routine.

Table 19-18 ODCIPredInfo Operator Related Information - Attributes

Name	Datatype	Purpose
ObjectSchema	VARCHAR2(30)	Schema of operator/function
ObjectName	VARCHAR2(30)	Name of operator/function
MethodName	VARCHAR2(30)	Name of method, applies only to package methods type
Flags	NUMBER	Possible flags are: `PredExactMatch` - Exact Match `PredPrefixMatch` - Prefix Match `PredIncludeStart` - Bounds include the start key value `PredIncludeStop` - Bounds include the stop key value `PredMultiTable` - Predicate involves multiple tables `PredObjectFunc` - Object is a function `PredObjectPlg` - Object is a package `PredObjectType` - Object is a type

ODCIIndexCtx

Object type. Stores the index context, including the domain index metadata and the rowid. It is passed as parameter to the functional implementation of an operator that expects index context.

Table 19-19 ODCIIndexCtx Index Context Related Information - Attributes

Name	Datatype	Purpose
IndexInfo	ODCIIndexInfo	Stores the metadata information about the domain index
rid	VARCHAR2("M_URID_SZ")	Row identifier of the current row

ODCIObject

Object type. Stores information about a schema object.

Table 19-20 ODCIObject Index Context Related Information - Attributes

Name	Datatype	Purpose
ObjectSchema	VARCHAR2(30)	Name of schema in which object is located
ObjectName	VARCHAR2(30)	Name of object

ODCIObjectList

Stores information about a list of schema objects.

Datatype

VARRAY(32) OF ODCIObject

ODCIPartInfo

Object type. Contains the names of both the table partition and the index partition.

Table 19-21 ODCIPartInfo Index-Related Information - Attributes

Name	Datatype	Purpose
TablePartition	`VARCHAR2(30)`	Contains the table partition name
IndexPartition	`VARCHAR2(30)`	Contains the index partition name

ODCIQueryInfo

Object type. Stores information about the context of a query. It is passed as a parameter to the ODCIIndexStart routine.

Table 19-22 ODCIQueryInfo Index Context Related Information - Attributes

Name	Datatype	Purpose
Flags	NUMBER	The following flags can be set: `QueryFirstRows` - Set when the optimizer hint `FIRST_ROWS` is specified in the query `QueryAllRows` - Set when the optimizer hint `ALL_ROWS` is specified in the query
AncOps	ODCIObjectList	Ancillary operators referenced in the query

ODCIStatsOptions

Object type. Stores options information for DBMS_STATS.

Table 19-23 ODCIStatsOptions Cost Information - Attributes

Name	Datatype	Purpose
Sample	NUMBER	Sample size
Options	NUMBER	`DBMS_STATS` options - see "ODCICost"
Flags	NUMBER	`DBMS_STATS` flags - see "ODCICost"

ODCITabFuncStats

Object type. Stores cardinality information for a table function.

Table 19-24 ODCITabFuncStats Parameter

Parameter	Datatype	Purpose
`num_rows`	`NUMBER`	Contains the number of rows expected to be returned by the table function

ODCITabStats

Stores table statistics for a table function.

Datatype

NUMBER

Table 19-25 ODCITabStats - Attributes

Name	Datatype	Purpose
`Num_rows`	`NUMBER`	Number of rows in table

ODCIBFileList

Stores varrays of BFILEs.

Datatype

VARRAY(32767) OF BFILE

ODCITabFuncInfo

Object type. Stores information on which attributes of user-defined types in a collection need to be set by a table function.

Table 19-26 ODCITabFuncInfo Parameters

Name	Datatype	Purpose
`Attrs`	`ODCINumberList`	Indicates the attributes that need to be set
`RetType`	`AnyType`	For `AnyDataSet` table functions, indicates the actual return type to be expected in the `AnyDataSet` collection

ODCIDateList

Stores varrays of DATEs.

Datatype

VARRAY(32767) OF DATE

ODCINumberList

Stores varrays of NUMBERs.

Datatype

VARRAY(32767) OF NUMBER

ODCIRawList

Stores varrays of Raws.

Datatype

VARRAY(32767) OF Raw(2000)

ODCIVarchar2List

Stores varrays of VARCHAR2s

Datatype

VARRAY(32767) OF VARCHAR2(4000)

ODCIFuncCallInfo

Object type. Stores information about the functional implementation of an operator.

Table 19-27 ODCIFuncCallInfo - Attributes

Name	Datatype	Purpose
`ColInfo`	`ODCIColInfo`	Information about the column on which the operator is invoked

Usage Notes

A functional implementation can be defined with this parameter only if the operator binding is declared WITH COLUMN CONTEXT. This is useful if the functional implementation requires information about the column it was invoked on, and there is no domain index defined on the column. This argument is only populated in the function invocation if the first argument of the operator invocation is a column and there is no domain index defined on that column.

Mappings of Constants and Types

This section describes language-specific mappings.

Mappings in PL/SQL

A variety of PL/SQL mappings are common to both Extensible Indexing and the Extensible Optimizer.

Constants are defined in the ODCIConst package found in catodci.sql
Types are defined as object types found in catodci.sql

Mappings in C

Mappings of constants and types are defined for C in the public header file odci.h. Each C structure to which a type is mapped has a corresponding indicator structure called structname_ind and a reference definition called structname_ref.

Mappings in Java

The ODCI (Oracle Data Cartridge Interface) interfaces are described in the Oracle Data Cartridge Java API Reference documentation. To use these classes, you must first load them.