gistfile1.txt

Pig Stack Trace
---------------
ERROR 2120: Internal Error: Unable to determine data type for map key

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias signals_w_snapshots
   at org.apache.pig.PigServer.openIterator(PigServer.java:754)
   at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:612)
   at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:303)
   at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
   at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:141)
   at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90)
   at org.apache.pig.Main.run(Main.java:510)
   at org.apache.pig.Main.main(Main.java:107)
Caused by: org.apache.pig.PigException: ERROR 1002: Unable to store alias signals_w_snapshots
   at org.apache.pig.PigServer.storeEx(PigServer.java:878)
   at org.apache.pig.PigServer.store(PigServer.java:816)
   at org.apache.pig.PigServer.openIterator(PigServer.java:728)
   ... 7 more
Caused by: org.apache.pig.impl.plan.VisitorException: ERROR 2120: Internal Error: Unable to determine data type for map key
   at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.KeyTypeDiscoveryVisitor.visitMROp(KeyTypeDiscoveryVisitor.java:99)
   at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper.visit(MapReduceOper.java:246)
   at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper.visit(MapReduceOper.java:41)
   at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:69)
   at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:71)
   at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:71)
   at org.apache.pig.impl.plan.DepthFirstWalker.walk(DepthFirstWalker.java:52)
   at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
   at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.compile(MapReduceLauncher.java:514)
   at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:117)
   at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:378)
   at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1198)
   at org.apache.pig.PigServer.storeEx(PigServer.java:874)
   ... 9 more
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