[PIG-4511] Add columns to prune from PluckTuple

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 0.15.0
• Patch Info: Patch Available
• Hadoop Flags: Reviewed
• Assignee: Joseph Babcock
• Reporter: Joseph Babcock
• Created: 17/Apr/15 15:41
• Updated: 07/Jun/15 03:47
• Resolved: 27/Apr/15 15:44

Description

Currently pluckTuple returns all columns in relation that match a prefix predicate. This patch allows a boolean flag 'false' to specify that columns NOT matching this prefix should be retained.

Example:

<source>
a = load 'a' as (x:int,y:chararray,z:long)
b = load 'b' as (x:int,y:chararray,z:long)
c = join a by x, b by x;
Define pluck PluckTuple('a::','false')
– returns b
</source>