org.apache.hadoop.hive.ql.optimizer
Class ColumnPrunerProcFactory.ColumnPrunerPTFProc

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.ColumnPrunerProcFactory.ColumnPrunerPTFProc

All Implemented Interfaces:

NodeProcessor

Enclosing class:

ColumnPrunerProcFactory

public static class ColumnPrunerProcFactory.ColumnPrunerPTFProc
extends Object
implements NodeProcessor

- Pruning can only be done for Windowing. PTFs are black boxes, we assume all columns are needed. - add column names referenced in WindowFn args and in WindowFn expressions to the pruned list of the child Select Op. - finally we set the prunedColList on the ColumnPrunerContx; and update the RR & signature on the PTFOp.

Constructor Summary

ColumnPrunerProcFactory.ColumnPrunerPTFProc()

Method Summary

Object

process(Node nd, Stack<Node> stack, NodeProcessorCtx ctx, Object... nodeOutputs) Generic process for all ops that don't have specific implementations.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnPrunerProcFactory.ColumnPrunerPTFProc

public ColumnPrunerProcFactory.ColumnPrunerPTFProc()

Method Detail

process

public Object process(Node nd,
                      Stack<Node> stack,
                      NodeProcessorCtx ctx,
                      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

ctx - 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