[PIG-2970] Nested foreach getting incorrect schema when having unrelated inner query

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 0.12.0
• Component/s: parser
• Hadoop Flags: Reviewed
• Assignee: Daniel Dai
• Reporter: Koji Noguchi
• Created: 12/Oct/12 20:58
• Updated: 19/Mar/14 18:44
• Resolved: 02/May/13 00:46

Description

While looking at PIG-2968, hit a weird error message.

$ cat -n test/foreach2.pig
     1  daily = load 'nyse' as (exchange, symbol);
     2  grpd = group daily by exchange;
     3  unique = foreach grpd {
     4          sym = daily.symbol;
     5          uniq_sym = distinct sym;
     6          --ignoring uniq_sym result
     7          generate group, daily;
     8  };
     9  describe unique;
    10  zzz = foreach unique generate group;
    11  explain zzz;

% pig -x local -t ColumnMapKeyPrune test/foreach2.pig
...
unique: {symbol: bytearray}

2012-10-12 16:55:44,226 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1025: 
<file test/foreach2.pig, line 10, column 30> Invalid field projection. Projected field [group] does not exist in schema: symbol:bytearray.
...

Issue Links

• is duplicated by: PIG-2802 Wrong Schema generated when there is a dangling alias