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https://issues.apache.org/jira/browse/PIG-2320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13135443#comment-13135443
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Thejas M Nair commented on PIG-2320:
------------------------------------
+1
(the root cause: input relation index is incremented for joins and group-by
statement. This index is used while ProjectExpression is constructed. When the
group or join is nested in another statement, this index was not being reset as
it should have been.)
> Error: "projection with nothing to reference"
> ---------------------------------------------
>
> Key: PIG-2320
> URL: https://issues.apache.org/jira/browse/PIG-2320
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0, 0.10
> Reporter: Jonathan Coveney
> Fix For: 0.10, 0.9.2
>
> Attachments: PIG-2320-1.patch
>
>
> 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
> ================================================================================
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