org.apache.hadoop.hive.ql.optimizer

Class PrunerOperatorFactory.FilterPruner

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.PrunerOperatorFactory.FilterPruner

All Implemented Interfaces:

NodeProcessor

Direct Known Subclasses:

LBPartitionProcFactory.LBPRPartitionFilterPruner, LBProcFactory.LBPRFilterPruner, OpProcFactory.FilterPPR

Enclosing class:

PrunerOperatorFactory

public abstract static class PrunerOperatorFactory.FilterPruner
extends java.lang.Object
implements NodeProcessor

Determines the partition pruner for the filter. This is called only when the filter follows a table scan operator.

Constructor Summary

Constructors

Constructor and Description
FilterPruner()

Method Summary

Modifier and Type	Method and Description
protected void	addPruningPred(java.util.Map<TableScanOperator,ExprNodeDesc> opToPrunner, TableScanOperator top, ExprNodeDesc new_pruner_pred) Add pruning predicate.
protected void	addPruningPred(java.util.Map<TableScanOperator,java.util.Map<java.lang.String,ExprNodeDesc>> opToPrunner, TableScanOperator top, ExprNodeDesc new_pruner_pred, Partition part) Add pruning predicate.
protected abstract void	generatePredicate(NodeProcessorCtx procCtx, FilterOperator fop, TableScanOperator top) Generate predicate.
java.lang.Object	process(Node nd, java.util.Stack<Node> stack, NodeProcessorCtx procCtx, java.lang.Object... nodeOutputs) Generic process for all ops that don't have specific implementations.

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterPruner

public FilterPruner()

Method Detail

process

public java.lang.Object process(Node nd,
                                java.util.Stack<Node> stack,
                                NodeProcessorCtx procCtx,
                                java.lang.Object... nodeOutputs)
                         throws SemanticException

Description copied from interface: NodeProcessor

Generic process for all ops that don't have specific implementations.

Specified by:

process in interface NodeProcessor

Parameters:

nd - operator to process

procCtx - operator processor context

nodeOutputs - A variable argument list of outputs from other nodes in the walk

Returns:

Object to be returned by the process call

Throws:

SemanticException

generatePredicate

protected abstract void generatePredicate(NodeProcessorCtx procCtx,
                                          FilterOperator fop,
                                          TableScanOperator top)
                                   throws SemanticException,
                                          UDFArgumentException

Generate predicate. Subclass should implement the function. Please refer to OpProcFactory.FilterPPR

Parameters:

procCtx -

fop -

top -

Throws:

SemanticException

UDFArgumentException

addPruningPred

protected void addPruningPred(java.util.Map<TableScanOperator,ExprNodeDesc> opToPrunner,
                              TableScanOperator top,
                              ExprNodeDesc new_pruner_pred)
                       throws UDFArgumentException

Add pruning predicate.

Parameters:

opToPrunner -

top -

new_pruner_pred -

Throws:

UDFArgumentException

addPruningPred

protected void addPruningPred(java.util.Map<TableScanOperator,java.util.Map<java.lang.String,ExprNodeDesc>> opToPrunner,
                              TableScanOperator top,
                              ExprNodeDesc new_pruner_pred,
                              Partition part)
                       throws UDFArgumentException

Add pruning predicate.

Parameters:

opToPrunner -

top -

new_pruner_pred -

part -

Throws:

UDFArgumentException