org.apache.hadoop.hive.ql.optimizer
Class PrunerExpressionOperatorFactory

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.PrunerExpressionOperatorFactory

Direct Known Subclasses:

ExprProcFactory, LBExprProcFactory

public abstract class PrunerExpressionOperatorFactory
extends Object

Expression processor factory for pruning. Each processor tries to convert the expression subtree into a pruning expression. It can be used for partition prunner and list bucketing pruner.

Nested Class Summary

static class	PrunerExpressionOperatorFactory.ColumnExprProcessor Processor for column expressions.
static class	PrunerExpressionOperatorFactory.DefaultExprProcessor Processor for constants and null expressions.
static class	PrunerExpressionOperatorFactory.FieldExprProcessor FieldExprProcessor.
static class	PrunerExpressionOperatorFactory.GenericFuncExprProcessor If all children are candidates and refer only to one table alias then this expr is a candidate else it is not a candidate but its children could be final candidates.

Constructor Summary

PrunerExpressionOperatorFactory()

Method Summary

static NodeProcessor	getDefaultExprProcessor() Instantiate default expression processor.
static NodeProcessor	getFieldProcessor() Instantiate field processor.
static NodeProcessor	getGenericFuncProcessor() Instantiate generic function processor.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrunerExpressionOperatorFactory

public PrunerExpressionOperatorFactory()

Method Detail

getDefaultExprProcessor

public static final NodeProcessor getDefaultExprProcessor()

Instantiate default expression processor.

Returns:

getGenericFuncProcessor

public static final NodeProcessor getGenericFuncProcessor()

Instantiate generic function processor.

Returns:

getFieldProcessor

public static final NodeProcessor getFieldProcessor()

Instantiate field processor.

Returns: