[PIG-4126] No syntax to create single-column tuples

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Andy Boothe
• Created: 16/Aug/14 03:39
• Updated: 22/Aug/14 04:59

Description

There is currently no syntax to create a single-column tuple. For example, none of these work:

x = LOAD 'data.json' USING JsonLoader('a:chararray, b:chararray') AS (a:chararray, b:chararray);

1. The goal is to create a relation containing a tuple with a single column
2. For example: tpl: (value: chararray)
3. Creates a relation with a single column "a" that is a chararray
   a = foreach x generate (a) as (a: chararray);
   b = foreach x generate a as (a: chararray);
   c = foreach x generate a as a: chararray;

1. Python-style tuple syntax is a syntax error
   d = foreach x generate (a,) as (a: chararray);

1. Types are incompatible
   e = foreach x generate (a) as tuple(a: chararray)