org.apache.hadoop.hive.ql.exec.vector.expressions
Class IsNull
java.lang.Object
org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression
org.apache.hadoop.hive.ql.exec.vector.expressions.IsNull
- All Implemented Interfaces:
- Serializable
public class IsNull
- extends VectorExpression
This expression evaluates to true if the given input columns is null.
The boolean output is stored in the specified output column.
- See Also:
- Serialized Form
Constructor Summary |
IsNull()
|
IsNull(int colNum,
int outputColumn)
|
IsNull
public IsNull(int colNum,
int outputColumn)
IsNull
public IsNull()
evaluate
public void evaluate(VectorizedRowBatch batch)
- Description copied from class:
VectorExpression
- This is the primary method to implement expression logic.
- Specified by:
evaluate
in class VectorExpression
getOutputColumn
public int getOutputColumn()
- Description copied from class:
VectorExpression
- Returns the index of the output column in the array
of column vectors. If not applicable, -1 is returned.
- Specified by:
getOutputColumn
in class VectorExpression
- Returns:
- Index of the output column
getOutputType
public String getOutputType()
- Description copied from class:
VectorExpression
- Returns type of the output column.
- Overrides:
getOutputType
in class VectorExpression
getColNum
public int getColNum()
setColNum
public void setColNum(int colNum)
setOutputColumn
public void setOutputColumn(int outputColumn)
getDescriptor
public VectorExpressionDescriptor.Descriptor getDescriptor()
- Specified by:
getDescriptor
in class VectorExpression
Copyright © 2014 The Apache Software Foundation. All rights reserved.