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