[PIG-946] Combiner optimizer does not optimize when limit follow group, foreach

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.3.0
• Fix Version/s: 0.9.0
• Assignee: Thejas Nair
• Reporter: Pradeep Kamath
• Created: 04/Sep/09 22:51
• Updated: 04/Aug/11 00:35
• Resolved: 05/Jan/11 16:52

Description

The following script is combinable but is not optimized:
a = load '/user/pig/tests/data/singlefile/studenttab10k';
b = group a by $1;
c = foreach b generate group, AVG(a.$2);
d = limit c 10;
dump d;