[PIG-5209] Cross product on flatten(map) fails with ClassCastException

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.17.0
• Component/s: impl
• Hadoop Flags: Reviewed
• Assignee: Koji Noguchi
• Reporter: Koji Noguchi
• Created: 01/Apr/17 04:25
• Updated: 21/Jun/17 09:15
• Resolved: 03/Apr/17 16:43

Description

This issue started after we added a new flatten on map feature at PIG-5085.

For script like

B = foreach A GENERATE FLATTEN(map1), FLATTEN(map2);

it fails with

Caused by: java.lang.ClassCastException: java.util.HashMap cannot be cast to org.apache.pig.data.DataBag
    at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:514)
    at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNextTuple(POForEach.java:233)
    ... 12 more