org.apache.hadoop.hive.ql.optimizer.listbucketingpruner
Class LBExprProcFactory

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

public class LBExprProcFactory
extends PrunerExpressionOperatorFactory

Expression processor factory for list bucketing pruning. Each processor tries to convert the expression subtree into a list bucketing pruning expression. This expression is then used to figure out which skewed value to be used

Nested Class Summary

static class

LBExprProcFactory.LBPRColumnExprProcessor Processor for lbpr column expressions.

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.optimizer.PrunerExpressionOperatorFactory

PrunerExpressionOperatorFactory.ColumnExprProcessor, PrunerExpressionOperatorFactory.DefaultExprProcessor, PrunerExpressionOperatorFactory.FieldExprProcessor, PrunerExpressionOperatorFactory.GenericFuncExprProcessor

Method Summary

static ExprNodeDesc	genPruner(String tabAlias, ExprNodeDesc pred, Partition part) Generates the list bucketing pruner for the expression tree.
static NodeProcessor	getColumnProcessor() Instantiate column processor.

Methods inherited from class org.apache.hadoop.hive.ql.optimizer.PrunerExpressionOperatorFactory

getDefaultExprProcessor, getFieldProcessor, getGenericFuncProcessor

Methods inherited from class java.lang.Object

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

Method Detail

genPruner

public static ExprNodeDesc genPruner(String tabAlias,
                                     ExprNodeDesc pred,
                                     Partition part)
                              throws SemanticException

Generates the list bucketing pruner for the expression tree.

Parameters:

tabAlias - The table alias of the partition table that is being considered for pruning

pred - The predicate from which the list bucketing pruner needs to be generated

part - The partition this walker is walking

Throws:

SemanticException

getColumnProcessor

public static NodeProcessor getColumnProcessor()

Instantiate column processor.

Returns: