[PIG-2968] ColumnMapKeyPrune fails to prune a subtree inside foreach

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.11
• Component/s: parser
• Assignee: Koji Noguchi
• Reporter: Koji Noguchi
• Created: 12/Oct/12 19:01
• Updated: 22/Feb/13 04:53
• Resolved: 30/Oct/12 17:56

Description

Sample code

$ cat test/foreach.pig 
daily = load 'nyse' as (exchange, symbol);
grpd = group daily by exchange;
uniquecnt = foreach grpd {
        sym = daily.symbol;
        uniq_sym = distinct sym;
        generate group, uniq_sym;
};
another = FOREACH uniquecnt GENERATE group;
explain another;

This breaks when it tries to prune uniq_sym->sym->innerload_daily

2012-10-12 14:54:11,031 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2000: Error processing rule ColumnMapKeyPrune. Try -t ColumnMapKeyPrune