org.eigenbase.reltype
Class RelCrossType

java.lang.Object
  org.eigenbase.reltype.RelDataTypeImpl
      org.eigenbase.reltype.RelCrossType

All Implemented Interfaces:

RelDataType, RelDataTypeFamily

public class RelCrossType
extends RelDataTypeImpl

Type of the cartesian product of two or more sets of records.

Its fields are those of its constituent records, but unlike a RelRecordType, those fields' names are not necessarily distinct.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/reltype/RelCrossType.java#12 $

Author:

jhyde

Field Summary

RelDataType[]

types

Fields inherited from class org.eigenbase.reltype.RelDataTypeImpl

digest, fieldList, fields

Constructor Summary

RelCrossType(RelDataType[] types, RelDataTypeField[] fields)
Creates a cartesian product type.

Method Summary

protected void	generateTypeString(StringBuilder sb, boolean withDetail) Generates a string representation of this type.
RelDataTypeField	getField(String fieldName) Looks up a field by name.
int	getFieldOrdinal(String fieldName) Looks up the ordinal of a field by name.
RelDataTypeField[]	getFields() Gets the fields in a struct type.
RelDataType[]	getTypes()
boolean	isStruct() Queries whether this is a structured type.

Methods inherited from class org.eigenbase.reltype.RelDataTypeImpl

computeDigest, equals, getCharset, getCollation, getComparability, getComponentType, getFamily, getFieldCount, getFieldList, getFullTypeString, getIntervalQualifier, getPrecedenceList, getPrecision, getScale, getSqlIdentifier, getSqlTypeName, hashCode, isNullable, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

types

public final RelDataType[] types

Constructor Detail

RelCrossType

public RelCrossType(RelDataType[] types,
                    RelDataTypeField[] fields)

Creates a cartesian product type. This should only be called from a factory method.

"Precondition:"

types != null, types.length >= 1, !(types[i] instanceof CrossType)

Method Detail

isStruct

public boolean isStruct()

Description copied from interface: RelDataType

Queries whether this is a structured type.

Specified by:

isStruct in interface RelDataType

Overrides:

isStruct in class RelDataTypeImpl

Returns:

whether this type has fields; examples include rows and user-defined structured types in SQL, and classes in Java

getField

public RelDataTypeField getField(String fieldName)

Description copied from interface: RelDataType

Looks up a field by name.

Specified by:

getField in interface RelDataType

Overrides:

getField in class RelDataTypeImpl

Parameters:

fieldName - name of field to find

Returns:

named field, or null if not found

getFieldOrdinal

public int getFieldOrdinal(String fieldName)

Description copied from interface: RelDataType

Looks up the ordinal of a field by name.

Specified by:

getFieldOrdinal in interface RelDataType

Overrides:

getFieldOrdinal in class RelDataTypeImpl

Parameters:

fieldName - name of field to find

Returns:

0-based ordinal of named field, or -1 if not found

getFields

public RelDataTypeField[] getFields()

Description copied from interface: RelDataType

Gets the fields in a struct type. The field count is equal to the length of the returned array.

NOTE jvs 17-Dec-2004: this method will become deprecated once we move to Java generics, and eventually eliminated

Specified by:

getFields in interface RelDataType

Overrides:

getFields in class RelDataTypeImpl

Returns:

array of fields

getTypes

public RelDataType[] getTypes()

generateTypeString

protected void generateTypeString(StringBuilder sb,
                                  boolean withDetail)

Description copied from class: RelDataTypeImpl

Generates a string representation of this type.

Specified by:

generateTypeString in class RelDataTypeImpl

Parameters:

sb - StringBuffer into which to generate the string

withDetail - when true, all detail information needed to compute a unique digest (and return from getFullTypeString) should be included;