[PIG-3239] Unable to return multiple values from a macro using SPLIT

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 0.12.0

Environment

Apache Pig version 0.10.0-cdh4.2.0 (rexported)
compiled Feb 15 2013, 12:19:17

Linux 3.2.0-38-generic #61-Ubuntu SMP Tue Feb 19 12:18:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

• Assignee: Johnny Zhang
• Reporter: Luis Belloch
• Created: 06/Mar/13 13:06
• Updated: 14/Oct/13 16:45
• Resolved: 15/Mar/13 16:58

Description

Hi, I'm unable to return multiple values from a macro when values come from a SPLIT. Here is an small example:

DEFINE my_macro(seq) RETURNS valid, invalid {
    added = FOREACH $seq GENERATE $0 * 2, $1;
    SPLIT added INTO $valid IF $1 == true, $invalid OTHERWISE;
}

data = LOAD 'case.csv' USING PigStorage(',') AS (value: int, valid: boolean);
P, Q = my_macro(data);
DUMP P;
DUMP Q;

Pig is unable to recognize the OTHERWISE side. Error is: ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1200: <at case.pig, line 3> Invalid macro definition: . Reason: Macro 'my_macro' missing return alias: invalid

Simple workaround is to force $invalid to be returned as FOREACH result:

SPLIT added INTO $valid IF $1 == true, tmp_invalid OTHERWISE;
$invalid = FOREACH tmp_invalid GENERATE *;

Samples and logs attached to the issue.