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From "Santhosh Srinivasan (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-436) When a single column is flattened, the alias is lost in subsequent statements that refer to the alias
Date Thu, 18 Sep 2008 00:03:44 GMT
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


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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