org.apache.hadoop.hive.ql.exec.vector.expressions
Class VectorExpression

java.lang.Object
  org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AbstractFilterStringColLikeStringScalar, CastDecimalToDecimal, CastLongToDate, CastStringToDate, CastStringToDecimal, ColAndCol, ColOrCol, ConstantVectorExpression, DecimalColumnInList, DecimalToStringUnaryUDF, DoubleColumnInList, FilterColAndScalar, FilterColOrScalar, FilterDecimalColumnInList, FilterDoubleColumnInList, FilterExprAndExpr, FilterExprOrExpr, FilterLongColumnInList, FilterScalarAndColumn, FilterScalarOrColumn, FilterStringColumnInList, FuncDecimalToDouble, FuncDecimalToLong, FuncDoubleToDecimal, FuncLongToDecimal, FuncLongToString, FuncRand, FuncRandNoSeed, FuncRoundWithNumDigitsDecimalToDecimal, IdentityExpression, IfExprStringColumnStringColumn, IfExprStringColumnStringScalar, IfExprStringScalarStringColumn, IfExprStringScalarStringScalar, IsNotNull, IsNull, LongColDivideLongColumn, LongColDivideLongScalar, LongColumnInList, LongScalarDivideLongColumn, LongToStringUnaryUDF, MathFuncDoubleToDouble, MathFuncLongToDouble, MathFuncLongToLong, NotCol, SelectColumnIsFalse, SelectColumnIsNotNull, SelectColumnIsNull, SelectColumnIsTrue, StringColumnInList, StringConcatColCol, StringConcatColScalar, StringConcatScalarCol, StringLength, StringSubstrColStart, StringSubstrColStartLen, StringUnaryUDF, StringUnaryUDFDirect, VectorCoalesce, VectorUDFAdaptor, VectorUDFDateAddColCol, VectorUDFDateAddColScalar, VectorUDFDateAddScalarCol, VectorUDFDateDiffColCol, VectorUDFDateDiffColScalar, VectorUDFDateDiffScalarCol, VectorUDFTimestampFieldLong, VectorUDFTimestampFieldString

public abstract class VectorExpression
extends Object
implements Serializable

Base class for expressions.

See Also:

Serialized Form

Nested Class Summary

static class

VectorExpression.Type

Constructor Summary

VectorExpression()

Method Summary

abstract void	evaluate(VectorizedRowBatch batch) This is the primary method to implement expression logic.
VectorExpression[]	getChildExpressions()
abstract VectorExpressionDescriptor.Descriptor	getDescriptor()
VectorExpression.Type[]	getInputTypes()
abstract int	getOutputColumn() Returns the index of the output column in the array of column vectors.
String	getOutputType() Returns type of the output column.
void	setChildExpressions(VectorExpression[] ve) Initialize the child expressions.
void	setInputTypes(VectorExpression.Type... inputTypes) Set more detailed types to distinguish certain types that is represented in same VectorExpressionDescriptor.ArgumentTypes.
void	setOutputType(String type) Set type of the output column.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

VectorExpression

public VectorExpression()

Method Detail

evaluate

public abstract void evaluate(VectorizedRowBatch batch)

This is the primary method to implement expression logic.

Parameters:

batch -

getOutputColumn

public abstract int getOutputColumn()

Returns the index of the output column in the array of column vectors. If not applicable, -1 is returned.

Returns:

Index of the output column

getOutputType

public String getOutputType()

Returns type of the output column.

setOutputType

public void setOutputType(String type)

Set type of the output column.

setChildExpressions

public void setChildExpressions(VectorExpression[] ve)

Initialize the child expressions.

getChildExpressions

public VectorExpression[] getChildExpressions()

getDescriptor

public abstract VectorExpressionDescriptor.Descriptor getDescriptor()

setInputTypes

public void setInputTypes(VectorExpression.Type... inputTypes)

Set more detailed types to distinguish certain types that is represented in same VectorExpressionDescriptor.ArgumentTypes. For example, date and timestamp will be in LongColumnVector but they need to be distinguished.

Parameters:

inputTypes -

getInputTypes

public VectorExpression.Type[] getInputTypes()

toString

public String toString()

Overrides:

toString in class Object