[PIG-1808] Error message in 0.8 not much helpful as compared to 0.7

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.1
• Hadoop Flags: Reviewed
• Assignee: Daniel Dai
• Reporter: Vivek Padmanabhan
• Created: 17/Jan/11 14:50
• Updated: 25/Apr/11 21:27
• Resolved: 15/Mar/11 02:00

Description

A = LOAD 'i1' ;
B = LOAD 'i2' ;
C = JOIN A by $92 left outer,B by $92 ;
D = filter C by $100 is null;
DUMP D;

The below script fails both in 0.7 and 0.8 since A requires a valid schema to be defined. But the error message in 0.8 is not helpful.

Error message in 0.8
-----------------------------
ERROR 2000: Error processing rule PushUpFilter. Try -t PushUpFilter
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias D
....
Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2042: Error in new logical plan. Try -Dpig.usenewlogicalplan=false.
....
Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2000: Error processing rule PushUpFilter. Try -t PushUpFilter
....
Caused by: java.lang.NullPointerException
at org.apache.pig.newplan.logical.rules.PushUpFilter$PushUpFilterTransformer.hasAll(PushUpFilter.java:308)
at org.apache.pig.newplan.logical.rules.PushUpFilter$PushUpFilterTransformer.check(PushUpFilter.java:141)
at org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:108)
... 13 more

Error message in 0.7
-----------------------------
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias D
....
....
Caused by: org.apache.pig.backend.hadoop.executionengine.physicalLayer.LogicalToPhysicalTranslatorException:
ERROR 1109: Input (B) on which outer join is desired should have a valid schema