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Pig >> mail # user >> Can't JOIN self?


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Russell Jurney 2012-07-20, 02:34
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Re: Can't JOIN self?
Note: this works if I LOAD a new, 2nd relation and do the join.

On Thu, Jul 19, 2012 at 7:34 PM, Russell Jurney <[EMAIL PROTECTED]>wrote:

> I have a problem where I can't join a relation to itself on a different
> field.
>
> describe pairs
> pairs: {from: chararray,to: chararray,message_id: chararray,in_reply_to:
> chararray}
>
> pairs2 = pairs;
>
> with_reply = join pairs by in_reply_to, pairs2 by message_id;
>
>
> I get this error:
>
> 2012-07-19 19:31:16,927 [main] ERROR org.apache.pig.tools.grunt.Grunt -
> ERROR 1200: Pig script failed to parse:
> <line 20, column 6> pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
> 2012-07-19 19:31:16,928 [main] ERROR org.apache.pig.tools.grunt.Grunt -
> Failed to parse: Pig script failed to parse:
> <line 20, column 6> pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
> at
> org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:182)
>  at org.apache.pig.PigServer$Graph.validateQuery(PigServer.java:1565)
> at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1538)
>  at org.apache.pig.PigServer.registerQuery(PigServer.java:540)
> at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:970)
>  at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:189)
>  at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
> at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:69)
>  at org.apache.pig.Main.run(Main.java:490)
> at org.apache.pig.Main.main(Main.java:111)
>  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>  at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
>  at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> Caused by:
> <line 20, column 6> pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
>  at
> org.apache.pig.parser.LogicalPlanBuilder.buildJoinOp(LogicalPlanBuilder.java:363)
> at
> org.apache.pig.parser.LogicalPlanGenerator.join_clause(LogicalPlanGenerator.java:11354)
>  at
> org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1489)
> at
> org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:789)
>  at
> org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:507)
> at
> org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:382)
>  at
> org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:175)
> ... 15 more
>
>
> What am I to do?
> --
> Russell Jurney twitter.com/rjurney [EMAIL PROTECTED] datasyndrome.
> com
>

--
Russell Jurney twitter.com/rjurney [EMAIL PROTECTED] datasyndrome.com
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