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
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