If I can access the implicit 'group' column from within FOREACH like this:
GROUPED = GROUP InputRelVar by (firstDim,secondDim);
B = FOREACH GROUPED GENERATE group.firstDim;
... then should I not be able to do something like this?
B1 = FILTER GROUPED by group.firstDim == 'something';
I get messages like this:
java.lang.ClassCastException: java.lang.String cannot be cast to
org.apache.pig.data.Tuple
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:392)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:276)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:138)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:276)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POIsNull.getNext(POIsNull.java:72)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.PONot.getNext(PONot.java:71)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:148)
Interestingly I can use the 'group' alias overall like
B2 = FILTER GROUPED by group is not null;
Any explanations of what I am doing incorrect here?
thanks,
daniel
