outer join query looses name information
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Key: PIG-577
URL: https://issues.apache.org/jira/browse/PIG-577
Project: Pig
Issue Type: Bug
Affects Versions: types_branch
Reporter: Olga Natkovich
Fix For: types_branch
The following query:
A = LOAD 'student_data' AS (name: chararray, age: int, gpa: float);
B = LOAD 'voter_data' AS (name: chararray, age: int, registration: chararray,
contributions: float);
C = COGROUP A BY name, B BY name;
D = FOREACH C GENERATE group, flatten((IsEmpty(A) ? null : A)),
flatten((IsEmpty(B) ? null : B));
describe D;
E = FOREACH D GENERATE A::gpa, B::contributions;
Give the following error: (Even though describe shows correct information: D:
{group: chararray,A::name: chararray,A::age: int,A::gpa: float,B::name:
chararray,B::age: int,B::registration: chararray,B::contributions: float}
java.io.IOException: Invalid alias: A::gpa in {group:
chararray,bytearray,bytearray}
at org.apache.pig.PigServer.parseQuery(PigServer.java:298)
at org.apache.pig.PigServer.registerQuery(PigServer.java:263)
at
org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:439)
at
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:249)
at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:84)
at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:64)
at org.apache.pig.Main.main(Main.java:306)
Caused by: org.apache.pig.impl.logicalLayer.parser.ParseException: Invalid
alias: A::gpa in {group: chararray,bytearray,bytearray}
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.AliasFieldOrSpec(QueryParser.java:5930)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.ColOrSpec(QueryParser.java:5788)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseEvalSpec(QueryParser.java:3974)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.UnaryExpr(QueryParser.java:3871)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.CastExpr(QueryParser.java:3825)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.MultiplicativeExpr(QueryParser.java:3734)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.AdditiveExpr(QueryParser.java:3660)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.InfixExpr(QueryParser.java:3626)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.FlattenedGenerateItem(QueryParser.java:3552)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.FlattenedGenerateItemList(QueryParser.java:3462)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.GenerateStatement(QueryParser.java:3419)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.NestedBlock(QueryParser.java:2894)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.ForEachClause(QueryParser.java:2309)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:966)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.Expr(QueryParser.java:742)
at
org.apache.pig.impl.logicalLayer.parser.QueryParser.Parse(QueryParser.java:537)
at
org.apache.pig.impl.logicalLayer.LogicalPlanBuilder.parse(LogicalPlanBuilder.java:60)
at org.apache.pig.PigServer.parseQuery(PigServer.java:295)
... 6 more
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