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https://issues.apache.org/jira/browse/PIG-2181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vivek Padmanabhan updated PIG-2181:
-----------------------------------
Attachment: PIG-2181_1.patch
This looks like a change in behaviour introduced due to the parser changes. In
Pig 0.8 , "describe ; " would show the describe of the last alias
rather than NullPointerException. This is done through;
alias = mPigServer.getPigContext().getLastAlias(); , but in 0.9, the last
alias is not captured in Pig Context.
Attaching an initial patch.
> Improvement : for error message when describe misses alias
> ----------------------------------------------------------
>
> Key: PIG-2181
> URL: https://issues.apache.org/jira/browse/PIG-2181
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Vivek Padmanabhan
> Priority: Minor
> Labels: newbie
> Attachments: PIG-2181_1.patch
>
>
> In Pig 0.9, if I have a describe without an alias, it throws a
> NullPointerException like below.
> ERROR 2999: Unexpected internal error. null
> java.lang.NullPointerException
> at
> org.apache.pig.tools.grunt.GruntParser.processDescribe(GruntParser.java:270)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:317)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:188)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164)
> at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:81)
> at org.apache.pig.Main.run(Main.java:553)
> at org.apache.pig.Main.main(Main.java:108)
> For example;
> describe;
> This message is of no use from a users perspective. Especially when my script
> becomes large and I have added couple of describe statements.
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