org.apache.hadoop.hive.ql.optimizer

Class SimpleFetchOptimizer

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.Transform

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

public class SimpleFetchOptimizer
extends 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

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 org.apache.hadoop.hive.ql.optimizer.Transform

beginPerfLogging, endPerfLogging, endPerfLogging

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 class: Transform

All transformation steps implement this interface.

Specified by:

transform in class Transform

Parameters:

pctx - input parse context

Returns:

ParseContext

Throws:

SemanticException

replaceFSwithLS

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