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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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