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https://issues.apache.org/jira/browse/PIG-1462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881550#action_12881550
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Ashutosh Chauhan commented on PIG-1462:
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This has come up before. As noted on PIG-798 correct way to achieve this is
{code}
grunt> in = load 'data' using PigStorage() as (m:map[]);
grunt> tags = foreach in generate (tuple(chararray)) m#'k1' as tagtuple;
grunt> dump tags;
{code}
We probably need to add a note about casting in cookbook. Also, need to
generate better error message.
> No informative error message on parse problem
> ---------------------------------------------
>
> Key: PIG-1462
> URL: https://issues.apache.org/jira/browse/PIG-1462
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Ankur
>
> Consider the following script
> in = load 'data' using PigStorage() as (m:map[]);
> tags = foreach in generate m#'k1' as (tagtuple: tuple(chararray));
> dump tags;
> This throws the following error message that does not really say that this is
> a bad declaration
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during
> parsing. Encountered "" at line 2, column 38.
> Was expecting one of:
>
> at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1170)
> at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1114)
> at org.apache.pig.PigServer.registerQuery(PigServer.java:425)
> at
> org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:737)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:324)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:162)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:138)
> at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:89)
> at org.apache.pig.Main.main(Main.java:391)
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