[HIVE-4186] NPE in ReduceSinkDeDuplication

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Component/s: Query Processor
• Assignee: Harish Butani
• Reporter: Harish Butani
• Created: 15/Mar/13 19:18
• Updated: 16/May/13 21:10
• Resolved: 19/Mar/13 21:21

Description

When you have a sequence of RedueSinks on constants you get this error:

java.lang.NullPointerException
	at org.apache.hadoop.hive.ql.optimizer.ReduceSinkDeDuplication$ReduceSinkDeduplicateProcFactory$ReducerReducerProc.getPartitionAndKeyColumnMapping(ReduceSinkDeDuplication.java:416)

The e.g. to generate this si:

select p_name from (select p_name from part distribute by 1 sort by 1) p distribute by 1 sort by 1

Sorry for the contrived e.g., but this actually happens when we stack windowing clauses (see PTF-Windowing branch)