org.apache.hadoop.hive.ql.exec.vector.expressions
Class FilterStringColumnInList
java.lang.Object
org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression
org.apache.hadoop.hive.ql.exec.vector.expressions.FilterStringColumnInList
- All Implemented Interfaces:
- Serializable, IStringInExpr
public class FilterStringColumnInList
- extends VectorExpression
- implements IStringInExpr
Evaluate an IN filter on a batch for a vector of strings.
This is optimized so that no objects have to be created in
the inner loop, and there is a hash table implemented
with Cuckoo hashing that has fast lookup to do the IN test.
- See Also:
- Serialized Form
FilterStringColumnInList
public FilterStringColumnInList()
FilterStringColumnInList
public FilterStringColumnInList(int colNum)
- After construction you must call setInListValues() to add the values to the IN set.
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
getOutputType
public String getOutputType()
- Description copied from class:
VectorExpression
- Returns type of the output column.
- Overrides:
getOutputType
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
getDescriptor
public VectorExpressionDescriptor.Descriptor getDescriptor()
- Specified by:
getDescriptor
in class VectorExpression
getInListValues
public byte[][] getInListValues()
setInListValues
public void setInListValues(byte[][] a)
- Specified by:
setInListValues
in interface IStringInExpr
Copyright © 2014 The Apache Software Foundation. All rights reserved.