com.lucidera.type
Class LucidDbTypeFactory

java.lang.Object
  org.eigenbase.reltype.RelDataTypeFactoryImpl
      org.eigenbase.sql.type.SqlTypeFactoryImpl
          org.eigenbase.oj.OJTypeFactoryImpl
              net.sf.farrago.type.FarragoTypeFactoryImpl
                  com.lucidera.type.LucidDbTypeFactory

All Implemented Interfaces:

FarragoTypeFactory, OJTypeFactory, RelDataTypeFactory

public class LucidDbTypeFactory
extends FarragoTypeFactoryImpl

LucidDbTypeFactory overrides FarragoTypeFactoryImpl with LucidDB-specific type derivation rules.

Version:

$Id: //open/dev/farrago/src/com/lucidera/type/LucidDbTypeFactory.java#10 $

Author:

John Pham

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.reltype.RelDataTypeFactoryImpl

RelDataTypeFactoryImpl.JavaType

Nested classes/interfaces inherited from interface org.eigenbase.reltype.RelDataTypeFactory

RelDataTypeFactory.FieldInfo, RelDataTypeFactory.ListFieldInfo

Field Summary

static int	DECIMAL_PRODUCT_SCALE_CAP Cap applied to the scale of a decimal multiplication product, if the product's ideal precision is too high to be supported by LucidDb.
static int	DECIMAL_QUOTIENT_SCALE_CAP Cap applied to the scale of a decimal division quotient.

Fields inherited from class org.eigenbase.oj.OJTypeFactoryImpl

mapOJClassToType

Constructor Summary

LucidDbTypeFactory(FarragoRepos repos)

Method Summary

RelDataType	createDecimalProduct(RelDataType type1, RelDataType type2) Similar to RelDataTypeFactoryImpl.createDecimalProduct(org.eigenbase.reltype.RelDataType, org.eigenbase.reltype.RelDataType) but caps the maximum scale at DECIMAL_PRODUCT_SCALE_CAP.
RelDataType	createDecimalQuotient(RelDataType type1, RelDataType type2) Similar to RelDataTypeFactoryImpl.createDecimalQuotient(org.eigenbase.reltype.RelDataType, org.eigenbase.reltype.RelDataType) but caps the maximum scale at DECIMAL_QUOTIENT_SCALE_CAP.
protected boolean	shouldRaggedFixedLengthValueUnionBeVariable() Controls behavior discussed here.
boolean	useDoubleMultiplication(RelDataType type1, RelDataType type2)

Methods inherited from class net.sf.farrago.type.FarragoTypeFactoryImpl

createCwmElementType, createCwmType, createCwmTypeImpl, createJavaType, createJdbcColumnType, createJdbcColumnType, createJoinType, createMofType, createResultSetType, createResultSetType, createSqlType, createSqlType, createSqlType, createStructTypeFromClassifier, getClassForJavaParamStyle, getClassForPrimitive, getDefaultCharset, getRepos, getValueAccessExpression, toOJClass

Methods inherited from class org.eigenbase.oj.OJTypeFactoryImpl

createArrayType, createOJClassForRecordType, toType

Methods inherited from class org.eigenbase.sql.type.SqlTypeFactoryImpl

canonize, createMultisetType, createSqlIntervalType, createTypeWithCharsetAndCollation, createTypeWithNullability, leastRestrictive

Methods inherited from class org.eigenbase.reltype.RelDataTypeFactoryImpl

copyType, createStructType, createStructType, createStructType, isJavaType, leastRestrictiveStructuredType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.eigenbase.oj.OJTypeFactory

toType

Methods inherited from interface org.eigenbase.reltype.RelDataTypeFactory

copyType, createArrayType, createMultisetType, createSqlIntervalType, createStructType, createStructType, createStructType, createTypeWithCharsetAndCollation, createTypeWithNullability, leastRestrictive

Field Detail

DECIMAL_PRODUCT_SCALE_CAP

public static final int DECIMAL_PRODUCT_SCALE_CAP

Cap applied to the scale of a decimal multiplication product, if the product's ideal precision is too high to be supported by LucidDb.

See Also:

Constant Field Values

DECIMAL_QUOTIENT_SCALE_CAP

public static final int DECIMAL_QUOTIENT_SCALE_CAP

Cap applied to the scale of a decimal division quotient.

See Also:

Constant Field Values

Constructor Detail

LucidDbTypeFactory

public LucidDbTypeFactory(FarragoRepos repos)

Method Detail

createDecimalProduct

public RelDataType createDecimalProduct(RelDataType type1,
                                        RelDataType type2)

Similar to RelDataTypeFactoryImpl.createDecimalProduct(org.eigenbase.reltype.RelDataType, org.eigenbase.reltype.RelDataType) but caps the maximum scale at DECIMAL_PRODUCT_SCALE_CAP.

Specified by:

createDecimalProduct in interface RelDataTypeFactory

Overrides:

createDecimalProduct in class RelDataTypeFactoryImpl

Parameters:

type1 - type of the first operand

type2 - type of the second operand

Returns:

the result type for a decimal multiplication, or null if decimal multiplication should not be applied to the operands.

useDoubleMultiplication

public boolean useDoubleMultiplication(RelDataType type1,
                                       RelDataType type2)

Specified by:

useDoubleMultiplication in interface RelDataTypeFactory

Overrides:

useDoubleMultiplication in class RelDataTypeFactoryImpl

Returns:

whether a decimal multiplication should be implemented by casting arguments to double values.

createDecimalQuotient

public RelDataType createDecimalQuotient(RelDataType type1,
                                         RelDataType type2)

Similar to RelDataTypeFactoryImpl.createDecimalQuotient(org.eigenbase.reltype.RelDataType, org.eigenbase.reltype.RelDataType) but caps the maximum scale at DECIMAL_QUOTIENT_SCALE_CAP.

Specified by:

createDecimalQuotient in interface RelDataTypeFactory

Overrides:

createDecimalQuotient in class RelDataTypeFactoryImpl

Parameters:

type1 - type of the first operand

type2 - type of the second operand

Returns:

the result type for a decimal division, or null if decimal division should not be applied to the operands.

shouldRaggedFixedLengthValueUnionBeVariable

protected boolean shouldRaggedFixedLengthValueUnionBeVariable()

Description copied from class: SqlTypeFactoryImpl

Controls behavior discussed here.

Overrides:

shouldRaggedFixedLengthValueUnionBeVariable in class SqlTypeFactoryImpl

Returns:

false (the default) to provide strict SQL:2003 behavior; true to provide pragmatic behavior