[PIG-1719] New logical plan: FieldSchema generation for BinCond is wrong

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.0
• Component/s: impl
• Hadoop Flags: Reviewed
• Assignee: Daniel Dai
• Reporter: Daniel Dai
• Created: 12/Nov/10 00:39
• Updated: 17/Dec/10 22:46
• Resolved: 19/Nov/10 19:54

Description

New logical plan generate incomplete schema for BinCond, if the expression for BinCond is of complex type. Eg,

a = load '1.txt' as (a0, a1:int);
b = group a by a0;
c = foreach b generate FLATTEN((IsEmpty(a)?{(65535)}:sequence.FIRST(a.a1)));

The right schema for c is (int), however, in current code, we get null schema. This is because BinCond should get the schema

{(int)}

, but we get empty bag {}.