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https://issues.apache.org/jira/browse/PIG-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712684#comment-14712684
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Dominique Dierickx commented on PIG-1991:
-----------------------------------------
We have a usecase were we added metadata information to our domain class in a
field called "_metadata". Obviously because of this issue we cannot query that
field for now; would be great to have this supported.
> Leading Underscore (_) not allowed in schema names
> --------------------------------------------------
>
> Key: PIG-1991
> URL: https://issues.apache.org/jira/browse/PIG-1991
> Project: Pig
> Issue Type: Wish
> Components: grunt
> Affects Versions: 0.9.0
> Reporter: Viraj Bhat
>
> I have a Pig script which uses underscore in its schema name (_a)
> {code}
> a = load 'test.txt' as (_a:long, b:chararray);
> dump a;
> {code}
> This causes an error in Pig:
> {quote}
> <line 1, column 24> Unexpected character '_'
> 2011-04-12 11:58:59,624 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1200: <line 1, column 24> Unexpected character '_'
> {quote}
> Stack trace:
> Pig Stack Trace
> ---------------
> ERROR 1200: <line 1, column 24> Unexpected character '_'
> Failed to parse: <line 1, column 24> Unexpected character '_'
> at
> org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:83)
> at org.apache.pig.PigServer$Graph.validateQuery(PigServer.java:1555)
> at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1527)
> at org.apache.pig.PigServer.registerQuery(PigServer.java:582)
> at
> org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:917)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:176)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:152)
> at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:76)
> at org.apache.pig.Main.run(Main.java:489)
> at org.apache.pig.Main.main(Main.java:108)
> ================================================================================
> Schema names should be allowed to have underscores.
> Viraj
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