When a single column is flattened, the alias is lost in subsequent statements
that refer to the alias
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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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