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

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

public final class VectorExpressionWriterFactory
extends Object

VectorExpressionWritableFactory helper class for generating VectorExpressionWritable objects.

Nested Class Summary

static interface	VectorExpressionWriterFactory.ListOIDClosure
static interface	VectorExpressionWriterFactory.SingleOIDClosure A poor man Java closure.

Constructor Summary

VectorExpressionWriterFactory()

Method Summary

static VectorExpressionWriter	genVectorExpressionWritable(ExprNodeDesc nodeDesc) Compiles the appropriate vector expression writer based on an expression info (ExprNodeDesc)
static VectorExpressionWriter	genVectorExpressionWritable(ObjectInspector fieldObjInspector) Compiles the appropriate vector expression writer based on an expression info (ExprNodeDesc)
static VectorExpressionWriter[]	getExpressionWriters(List<ExprNodeDesc> nodesDesc) Helper function to create an array of writers from a list of expression descriptors.
static VectorExpressionWriter[]	getExpressionWriters(StructObjectInspector objInspector) Returns VectorExpressionWriter objects for the fields in the given object inspector.
static VectorExpressionWriter[]	getSettableExpressionWriters(SettableStructObjectInspector objInspector)
static void	processVectorExpressions(List<ExprNodeDesc> nodesDesc, List<String> columnNames, VectorExpressionWriterFactory.SingleOIDClosure closure) Creates the value writers for a column vector expression list.
static void	processVectorExpressions(List<ExprNodeDesc> nodesDesc, VectorExpressionWriterFactory.ListOIDClosure closure) Creates the value writers for a column vector expression list.

Methods inherited from class java.lang.Object

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

Constructor Detail

VectorExpressionWriterFactory

public VectorExpressionWriterFactory()

Method Detail

genVectorExpressionWritable

public static VectorExpressionWriter genVectorExpressionWritable(ExprNodeDesc nodeDesc)
                                                          throws HiveException

Compiles the appropriate vector expression writer based on an expression info (ExprNodeDesc)

Throws:

HiveException

genVectorExpressionWritable

public static VectorExpressionWriter genVectorExpressionWritable(ObjectInspector fieldObjInspector)
                                                          throws HiveException

Compiles the appropriate vector expression writer based on an expression info (ExprNodeDesc)

Throws:

HiveException

getExpressionWriters

public static VectorExpressionWriter[] getExpressionWriters(List<ExprNodeDesc> nodesDesc)
                                                     throws HiveException

Helper function to create an array of writers from a list of expression descriptors.

Throws:

HiveException

processVectorExpressions

public static void processVectorExpressions(List<ExprNodeDesc> nodesDesc,
                                            List<String> columnNames,
                                            VectorExpressionWriterFactory.SingleOIDClosure closure)
                                     throws HiveException

Creates the value writers for a column vector expression list. Creates an appropriate output object inspector.

Throws:

HiveException

processVectorExpressions

public static void processVectorExpressions(List<ExprNodeDesc> nodesDesc,
                                            VectorExpressionWriterFactory.ListOIDClosure closure)
                                     throws HiveException

Creates the value writers for a column vector expression list. Creates an appropriate output object inspector.

Throws:

HiveException

getExpressionWriters

public static VectorExpressionWriter[] getExpressionWriters(StructObjectInspector objInspector)
                                                     throws HiveException

Returns VectorExpressionWriter objects for the fields in the given object inspector.

Parameters:

objInspector -

Returns:

Throws:

HiveException

getSettableExpressionWriters

public static VectorExpressionWriter[] getSettableExpressionWriters(SettableStructObjectInspector objInspector)
                                                             throws HiveException

Throws:

HiveException