[jira] [Commented] (PIG-1991) Leading Underscore (_) not allowed in schema names

["Adrien Mogenet (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14546785#comment-14546785 ] 

Adrien Mogenet commented on PIG-1991:
-------------------------------------

Another comment to say that we're currently building Parquet files through Spark + custom Scala world, and when "writing our case classes" to HDFS, the associated schema will contain fields such as `_1` and `_2`. 

I think there is no reason to forbid that.

At least, there should be a clear reason of why the script failed, but I think this may be addressed to the `PigLoader` authors.

> 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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