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

Class MurmurHashExpression

java.lang.Object

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

org.apache.hadoop.hive.ql.exec.vector.expressions.MurmurHashExpression

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

MurmurHashIntColIntCol, MurmurHashStringColIntCol, MurmurHashStringColStringCol

public abstract class MurmurHashExpression
extends VectorExpression

Base class for vectorized implementation of GenericUDFMurmurHash. See subclasses for int/string parameter variations.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

childExpressions, inputColumnNum, inputDataTypePhysicalVariations, inputTypeInfos, LOG, outputColumnNum, outputDataTypePhysicalVariation, outputTypeInfo

Constructor Summary

Constructors

Constructor and Description
MurmurHashExpression()
MurmurHashExpression(int colNumFirst, int colNumSecond, int outputColumnNum)

Method Summary

Modifier and Type	Method and Description
void	evaluate(VectorizedRowBatch batch) This is the primary method to implement expression logic.
VectorExpressionDescriptor.Descriptor	getDescriptor()
protected abstract void	hash(ColumnVector inputColVector1, ColumnVector inputColVector2, LongColumnVector outputColVector, int i, ByteBuffer byteBuffer) The actual hash method for an item in the input vectors.
protected abstract void	setArguments(VectorExpressionDescriptor.Builder builder)
String	vectorExpressionParameters()

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

displayArrayOfUtf8ByteArrays, displayUtf8Bytes, doTransientInit, doTransientInit, evaluateChildren, getChildExpressions, getChildExpressionsForTransientInit, getColumnParamString, getDoubleValueParamString, getInputDataTypePhysicalVariations, getInputTypeInfos, getLongValueParamString, getOutputColumnNum, getOutputColumnVectorType, getOutputDataTypePhysicalVariation, getOutputTypeInfo, getParamTypeString, getTypeName, init, setChildExpressions, setInputDataTypePhysicalVariations, setInputTypeInfos, setOutputDataTypePhysicalVariation, setOutputTypeInfo, shouldConvertDecimal64ToDecimal, supportsCheckedExecution, toString, transientInit

Methods inherited from class java.lang.Object

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

Constructor Detail

MurmurHashExpression

public MurmurHashExpression()

MurmurHashExpression

public MurmurHashExpression(int colNumFirst,
                            int colNumSecond,
                            int outputColumnNum)

Method Detail

vectorExpressionParameters

public String vectorExpressionParameters()

Specified by:

vectorExpressionParameters in class VectorExpression

evaluate

public void evaluate(VectorizedRowBatch batch)
              throws HiveException

Description copied from class: VectorExpression

This is the primary method to implement expression logic.

Specified by:

evaluate in class VectorExpression

Throws:

HiveException

hash

protected abstract void hash(ColumnVector inputColVector1,
                             ColumnVector inputColVector2,
                             LongColumnVector outputColVector,
                             int i,
                             ByteBuffer byteBuffer)

The actual hash method for an item in the input vectors. This implementation is supposed to be in line with non-vectorized one (ObjectInspectorUtils.getBucketHashCode) for multiple fields. The method is abstract and is supposed to be implemented in subclasses.

getDescriptor

public VectorExpressionDescriptor.Descriptor getDescriptor()

Specified by:

getDescriptor in class VectorExpression

setArguments

protected abstract void setArguments(VectorExpressionDescriptor.Builder builder)