[jira] Resolved: (PIG-436) When a single column is flattened, the alias is lost in subsequent statements that refer to the alias

["Olga Natkovich (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Olga Natkovich resolved PIG-436.
--------------------------------

    Resolution: Fixed

patch committed; thanks, pradeep!

> When a single column is flattened, the alias is lost in subsequent statements that refer to the alias
> -----------------------------------------------------------------------------------------------------
>
>                 Key: PIG-436
>                 URL: https://issues.apache.org/jira/browse/PIG-436
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Santhosh Srinivasan
>            Assignee: Pradeep Kamath
>             Fix For: types_branch
>
>         Attachments: PIG-436.patch
>
>
> When a single column is flattened, the front end generates aliases that disambiguate the columns in the flattened column. Subsequent statements that refer to this column always need to refer to the unambiguous alias even though there could be no ambiguity. A reproducible use case is given below:
> {code}
> a = load 'one' as (name, age, gpa);
> b = group a by name;
> c = foreach b generate flatten(a);
> d = foreach c generate name;
> e = foreach d generate name;
> 1971337 [main] ERROR org.apache.pig.tools.grunt.GruntParser  - java.io.IOException: Invalid alias: name in {a::name: bytearray}
>         at org.apache.pig.PigServer.parseQuery(PigServer.java:293)
>         at org.apache.pig.PigServer.registerQuery(PigServer.java:258)
>         at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:432)
>         at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:242)
>         at org.apache.pig.tools.grunt.GruntParser.parseContOnError(GruntParser.java:93)
>         at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:58)
>         at org.apache.pig.Main.main(Main.java:282)
> Caused by: org.apache.pig.impl.logicalLayer.parser.ParseException: Invalid alias: name in {a::name: bytearray}
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.AliasFieldOrSpec(QueryParser.java:5818)
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.ColOrSpec(QueryParser.java:5677)
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseEvalSpec(QueryParser.java:3969)
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.UnaryExpr(QueryParser.java:3866)
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.CastExpr(QueryParser.java:3820)
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.MultiplicativeExpr(QueryParser.java:3729)
>         at org.apache.pig.impl.logicalLayer.parser.QueryParser.AdditiveExpr(QueryParser.java:3653)
> {code}

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