[PIG-455] "group" alias is lost after a flatten(group)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.2.0
• Fix Version/s: 0.2.0
• Patch Info: Patch Available
• Assignee: Pradeep Kamath
• Reporter: Pradeep Kamath
• Created: 24/Sep/08 01:04
• Updated: 24/Mar/10 22:04
• Resolved: 24/Sep/08 22:37

Description

script:

a = load 'st10k' as (name, age, gpa);
b = group a by name;
c = foreach b generate flatten(group), COUNT(a) as cnt;
d = foreach c generate group;
dump d;

Error:

java.io.IOException: Invalid alias: group in {bytearray,cnt: long}
        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.parseStopOnError(GruntParser.java:83)
        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: group in {bytearray,cnt: long}
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.AliasFieldOrSpec(QueryParser.java:5851)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.ColOrSpec(QueryParser.java:5709)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseEvalSpec(QueryParser.java:4012)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.UnaryExpr(QueryParser.java:3909)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.CastExpr(QueryParser.java:3863)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.MultiplicativeExpr(QueryParser.java:3772)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.AdditiveExpr(QueryParser.java:3698)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.InfixExpr(QueryParser.java:3664)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.FlattenedGenerateItem(QueryParser.java:3590)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.FlattenedGenerateItemList(QueryParser.java:3500)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.GenerateStatement(QueryParser.java:3457)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.NestedBlock(QueryParser.java:2933)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.ForEachClause(QueryParser.java:2336)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:973)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.Expr(QueryParser.java:748)
        at org.apache.pig.impl.logicalLayer.parser.QueryParser.Parse(QueryParser.java:549)
        at org.apache.pig.impl.logicalLayer.LogicalPlanBuilder.parse(LogicalPlanBuilder.java:60)
        at org.apache.pig.PigServer.parseQuery(PigServer.java:290)
        ... 6 more