org.apache.hadoop.hive.ql.optimizer

Class SimpleFetchOptimizer

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer

All Implemented Interfaces:

Transform

public class SimpleFetchOptimizer
extends Object
implements Transform

Tries to convert simple fetch query to single fetch task, which fetches rows directly from location of table/partition.

Constructor Summary

Constructors

Constructor and Description
SimpleFetchOptimizer()

Method Summary

Methods

Modifier and Type	Method and Description
static ListSinkOperator	replaceFSwithLS(Operator<?> fileSink, String nullFormat)
ParseContext	transform(ParseContext pctx) All transformation steps implement this interface.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleFetchOptimizer

public SimpleFetchOptimizer()

Method Detail

transform

public ParseContext transform(ParseContext pctx)
                       throws SemanticException

Description copied from interface: Transform

All transformation steps implement this interface.

Specified by:

transform in interface Transform

Parameters:

pctx - input parse context

Returns:

ParseContext

Throws:

SemanticException

replaceFSwithLS

public static ListSinkOperator replaceFSwithLS(Operator<?> fileSink,
                               String nullFormat)