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Pig >> mail # user >> Error: "projection with nothing to reference"


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Re: Error: "projection with nothing to reference"
This is not a known bug. Can you please open a jira ?

-Thejas
On 10/14/11 1:15 PM, Jonathan Coveney wrote:
> I'm wonder if this is a known bug, or what. Here is a test script that
> isolates:
>
> a = load 'data1' as (x:int);
> b = load 'data2' as (y:int);
>
> val1 = foreach (filter (cogroup a by x, b by y) by COUNT(b) == 0) generate
> flatten(a);
> describe val1;
>
> I found that this script works in 0.8, but messes up in 0.9 and trunk (error
> is from trunk).
>
> the error:
> 2011-10-14 13:12:48,526 [main] ERROR org.apache.pig.tools.grunt.Grunt -
> ERROR 1200: Pig script failed to parse:
> <file pig9bug.pig, line 4, column 16>  pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
>
> stack trace:
> Pig Stack Trace
> ---------------
> ERROR 1200: Pig script failed to parse:
> <file pig9bug.pig, line 4, column 16>  pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
>
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during
> parsing. Pig script failed to parse:
> <file pig9bug.pig, line 4, column 16>  pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
>      at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1598)
>      at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1541)
>      at org.apache.pig.PigServer.registerQuery(PigServer.java:541)
>      at
> org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:943)
>      at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
>      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:561)
>      at org.apache.pig.Main.main(Main.java:111)
> Caused by: Failed to parse: Pig script failed to parse:
> <file pig9bug.pig, line 4, column 16>  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:178)
>      at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1590)
>      ... 9 more
> Caused by:
> <file pig9bug.pig, line 4, column 16>  pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2225: Projection
> with nothing to reference!
>      at
> org.apache.pig.parser.LogicalPlanBuilder.buildFilterOp(LogicalPlanBuilder.java:173)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.filter_clause(LogicalPlanGenerator.java:6122)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1153)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.inline_op(LogicalPlanGenerator.java:5502)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.rel(LogicalPlanGenerator.java:5432)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.foreach_clause(LogicalPlanGenerator.java:12109)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1373)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:692)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:492)
>      at
> org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:378)
>      at
> org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:171)
>      ... 10 more
> ===============================================================================>