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https://issues.apache.org/jira/browse/PIG-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940661#comment-13940661
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Koji Noguchi commented on PIG-2970:
-----------------------------------
bq. Koji Horaguchi is right, we shall iterate inner plan sinks to find
LOGenerate. This is applicable to LOForeach.getSchema(). After
DanglingNestedNodeRemover, it is safe to assume LOGenerate is the only sink, so
we don't need to sprawl the change to optimizer. I will bring some of Koji's
change in PIG-3807.
Thanks Daniel, but a different Koji again. It's [~knoguchi]. :)
> Nested foreach getting incorrect schema when having unrelated inner query
> -------------------------------------------------------------------------
>
> Key: PIG-2970
> URL: https://issues.apache.org/jira/browse/PIG-2970
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.10.0
> Reporter: Koji Noguchi
> Assignee: Daniel Dai
> Priority: Minor
> Fix For: 0.12.0
>
> Attachments: PIG-2970-0.patch, PIG-2970-1.patch, PIG-2970-2.patch,
> pig-2970-trunk-v01.txt, pig-2970-trunk-v02.txt
>
>
> While looking at PIG-2968, hit a weird error message.
> {noformat}
> $ 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.
> ...
> {noformat}
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