[PIG-4638] Allow TOMAP to accept dynamically sized input

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.15.0
• Fix Version/s: 0.16.0
• Hadoop Flags: Reviewed
• Release Note: The TOMAP function now also accepts a bag of key-value pairs as input.
• Assignee: Niels Basjes
• Reporter: Niels Basjes
• Created: 23/Jul/15 20:17
• Updated: 08/Jun/16 20:48
• Resolved: 05/Aug/15 17:42

Description

Currently the TOMAP function only supports a parameter list of values.
Triggered by reading http://stackoverflow.com/q/17847970/

I want to convert a bag of tuples to a map with specific value in each tuple as key. Basically I want to change:
{(id1, value1),(id2, value2), ...} into [id1#value1, id2#value2]

I propose to make the TOMAP accept both the current form

TOMAP($0, $1, $2, $3)

and a new form where the a single parameter:
A bag of Tuples where each Tuple has exactly two fields: a "key" and a "value".

Issue Links

• requires: PIG-4405 Adding 'map[]' support to mock/Storage