[PIG-3940] NullPointerException writing .pig_header for field with null name (in JsonMetadata.java)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.12.0
• Fix Version/s: 0.13.0
• Component/s: impl
• Labels: PigStorage schema storage
• Patch Info: Patch Available
• Release Note: Fixed NullPointerException writing schema headers for fields with null names. They are now written as '$i' corresponding to the field's zero-based position.
• Assignee: Flip Kromer
• Reporter: Flip Kromer
• Created: 16/May/14 11:10
• Updated: 07/Jul/14 18:08
• Resolved: 19/May/14 21:39

Description

Pig throws an NPE writing .pig_header for field with null name. Attached patch has it instead write field name as '$i' corresponding to the field's zero-based position – i.e., if the second field is unnamed, its header will be written as $1.

Caused by: java.lang.NullPointerException
	at org.apache.pig.builtin.JsonMetadata.storeSchema(JsonMetadata.java:319)
	at org.apache.pig.builtin.PigStorage.storeSchema(PigStorage.java:578)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputCommitter.storeCleanup(PigOutputCommitter.java:144)