[PIG-2004] Incorrect input types passed on to eval function

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.9.0
• Component/s: impl
• Assignee: Thejas Nair
• Reporter: Vivek Padmanabhan
• Created: 20/Apr/11 10:16
• Updated: 04/Aug/11 00:35
• Resolved: 26/Apr/11 19:24

Description

The below script fails by throwing a ClassCastException from the MAX udf. The udf expects the value of the bag supplied to be databyte array, but at run time the udf gets the actual type, ie Double in this case. This causes the script execution to fail with exception;

Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to org.apache.pig.data.DataByteArray

The same script runs properly with Pig 0.8.

A = LOAD 'myinput' as (f1,f2,f3);
B = foreach A generate f1,f2+f3/1000.0 as doub;
C = group B by f1;
D = foreach C generate (long)(MAX(B.doub)) as f4;
dump D;

myinput
-------
a 1000 12345
b 2000 23456
c 3000 34567
a 1500 54321
b 2500 65432