Bad error message when period rather than comma appears as separator in UDF 
parameter list 
-------------------------------------------------------------------------------------------

                 Key: PIG-618
                 URL: https://issues.apache.org/jira/browse/PIG-618
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Viraj Bhat
             Fix For: types_branch


Pig script generates the following compile-time error as it contains a period 
between 0.8 and 0.9 in the MYUDF parameter list. The "Invalid alias MYUDF" 
message should be changed to something that is more meaningful for the user to 
trace.
{code}
register 'MYUDF.jar';
A = load 'mydata.txt' using PigStorage() as (
        col1:   int,
        col2:   chararray,
        col3:   long,
        col4:   int
        );

B =  group A by (
        col1,
        col2
        );

C = foreach B generate
        group,
        MYUDF(A.col3, 0.0, 0.8. 0.9) as stat: (min, max);
describe C;
{code}
========================================================================================================
java.io.IOException: Invalid alias: MYUDF in {group: (col1: int,col2: 
chararray),A: {col1: int,col2: chararray,col
3: long,col4: int}}
        at org.apache.pig.PigServer.parseQuery(PigServer.java:301)
        at org.apache.pig.PigServer.registerQuery(PigServer.java:266)
        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: MYUDF in {group: (col1: int,col2
: chararray),A: {col1: int,col2: chararray,col3: long,col4: int}}
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.AliasFieldOrSpec(QueryParser.java:6005)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.ColOrSpec(QueryParser.java:5863)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseEvalSpec(QueryParser.java:4049)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.UnaryExpr(QueryParser.java:3946)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.CastExpr(QueryParser.java:3900)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.MultiplicativeExpr(QueryParser.java:3809)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.AdditiveExpr(QueryParser.java:3735)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.InfixExpr(QueryParser.java:3701)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.FlattenedGenerateItem(QueryParser.java:3627)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.FlattenedGenerateItemList(QueryParser.java:3550)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.GenerateStatement(QueryParser.java:3494)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.NestedBlock(QueryParser.java:2969)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.ForEachClause(QueryParser.java:2384)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:1019)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.Expr(QueryParser.java:795)
        at 
org.apache.pig.impl.logicalLayer.parser.QueryParser.Parse(QueryParser.java:590)
        at 
org.apache.pig.impl.logicalLayer.LogicalPlanBuilder.parse(LogicalPlanBuilder.java:60)
        at org.apache.pig.PigServer.parseQuery(PigServer.java:298)
========================================================================================================


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