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

SimpleFetchOptimizer()

Method Summary

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

Methods inherited from class java.lang.Object

equals, 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)