nested foreach - alias for expression does not work
---------------------------------------------------
Key: PIG-1798
URL: https://issues.apache.org/jira/browse/PIG-1798
Project: Pig
Issue Type: Bug
Affects Versions: 0.8.0
Reporter: Thejas M Nair
In following example, the nested foreach statement has an alias ld used for
output of distinct udf . Pig gives an error during query plan generation -
{code}
grunt> l = load 'x' as (a, b);
grunt> g = group l by a;
grunt> f = foreach g { ld = org.apache.pig.builtin.Distinct(l); f = filter ld
by $0 > 1; generate COUNT(f);}
grunt> explain f;
2011-01-11 12:18:33,908 [main] WARN org.apache.pig.PigServer - Encountered
Warning IMPLICIT_CAST_TO_INT 1 time(s).
2011-01-11 12:18:33,908 [main] INFO
org.apache.pig.backend.hadoop.executionengine.HExecutionEngine -
pig.usenewlogicalplan is set to true. New logical plan will be used.
2011-01-11 12:18:33,941 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
1067: Unable to explain alias f
Details at logfile: /Users/tejas/pig_comb2/trunk/pig_1294777094048.log
less /Users/tejas/pig_comb2/trunk/pig_1294777094048.log
Pig Stack Trace
---------------
ERROR 1067: Unable to explain alias f
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1067: Unable to
explain alias f
at org.apache.pig.PigServer.explain(PigServer.java:1053)
at
org.apache.pig.tools.grunt.GruntParser.explainCurrentBatch(GruntParser.java:358)
at
org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:290)
at
org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:253)
at
org.apache.pig.tools.pigscript.parser.PigScriptParser.Explain(PigScriptParser.java:665)
at
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:325)
at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:166)
at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:142)
at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:76)
at org.apache.pig.Main.run(Main.java:475)
at org.apache.pig.Main.main(Main.java:109)
Caused by: java.lang.NullPointerException
at
org.apache.pig.newplan.logical.ForeachInnerPlanVisitor.translateInnerPlanConnection(ForeachInnerPlanVisitor.java:87)
at
org.apache.pig.newplan.logical.ForeachInnerPlanVisitor.visit(ForeachInnerPlanVisitor.java:245)
at org.apache.pig.impl.logicalLayer.LOFilter.visit(LOFilter.java:114)
at
org.apache.pig.impl.logicalLayer.LogicalOperator.visit(LogicalOperator.java:1)
at
org.apache.pig.impl.plan.DependencyOrderWalkerWOSeenChk.walk(DependencyOrderWalkerWOSeenChk.java:71)
at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
at
org.apache.pig.newplan.logical.LogicalPlanMigrationVistor.visit(LogicalPlanMigrationVistor.java:245)
at org.apache.pig.impl.logicalLayer.LOForEach.visit(LOForEach.java:132)
at
org.apache.pig.impl.logicalLayer.LogicalOperator.visit(LogicalOperator.java:1)
at
org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:70)
at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
at
org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:264)
at org.apache.pig.PigServer.compilePp(PigServer.java:1460)
at org.apache.pig.PigServer.explain(PigServer.java:1022)
... 10 more
================================================================================
{code}
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