cascading.lingual.optiq
Class EnumerableTapRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      cascading.lingual.optiq.EnumerableTapRule

public class EnumerableTapRule
extends org.eigenbase.relopt.RelOptRule

Rule that converts a Cascading Tap into an enumerable.

Usually a Tap is the leaf of a plan that represents a Cascading flow, and this results in a MapReduce job at runtime. But if the query is just "select * from aTable" then it makes sense to read directly from the tap.

Field Summary

static EnumerableTapRule

INSTANCE

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Method Summary

void	onMatch(org.eigenbase.relopt.RelOptRuleCall call)

Methods inherited from class org.eigenbase.relopt.RelOptRule

any, any, convert, convertList, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, leaf, leaf, matches, some, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final EnumerableTapRule INSTANCE

Method Detail

onMatch

public void onMatch(org.eigenbase.relopt.RelOptRuleCall call)

Specified by:

onMatch in class org.eigenbase.relopt.RelOptRule