[ 
https://issues.apache.org/jira/browse/ASTERIXDB-1267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Yingyi Bu resolved ASTERIXDB-1267.
----------------------------------
    Resolution: Fixed

I think the issue has been fixed after Murtadha's fix for ASTERIXDB-1340.  I 
tried a 9 NC cluster (3 partitions each NC) on my local machine and it works. 
(The trace is independent of the amount of data to process.)

[~pouria][~javierjia], please re-open it if you still see the issue.

> TPCH query failure with runtime error at scale
> ----------------------------------------------
>
>                 Key: ASTERIXDB-1267
>                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1267
>             Project: Apache AsterixDB
>          Issue Type: Bug
>            Reporter: Pouria
>            Assignee: Yingyi Bu
>
> - TPC-H query 4 (AQL) fails with a internal/runtime error, only at scale. 
> - This query works fine against an asterixdb instance with a simple 
> configuration (it passes our build tests for example) - but it fails on 
> cluster (I am using 9 NCs, 3 partitions (IO device) each).
> - This query was working fine back in Summer 2015, and it seems a recent 
> check-in broke it.
> - Here is the query:
> {noformat}
> declare function tmp()
> {
>   for $l in dataset('LineItem')
>   where $l.l_commitdate < $l.l_receiptdate
>   distinct by $l.l_orderkey
>   return { "o_orderkey": $l.l_orderkey }
> }
> for $o in dataset('Orders')
> for $t in tmp()
> where $o.o_orderkey = $t.o_orderkey and 
>   $o.o_orderdate >= '1993-07-01' and $o.o_orderdate < '1993-10-01' 
> group by $o_orderpriority := $o.o_orderpriority with $o
> order by $o_orderpriority
> return {
>   "order_priority": $o_orderpriority,
>   "count": count($o)
> }
> {noformat}
> - Here is the optimized plan:
> {noformat}
> distribute result [%0->$$25]
> -- DISTRIBUTE_RESULT  |PARTITIONED|
>   exchange 
>   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>     project ([$$25])
>     -- STREAM_PROJECT  |PARTITIONED|
>       assign [$$25] <- [function-call: asterix:closed-record-constructor, 
> Args:[AString: {order_priority}, %0->$$3, AString: {count}, %0->$$35]]
>       -- ASSIGN  |PARTITIONED|
>         exchange 
>         -- SORT_MERGE_EXCHANGE [$$3(ASC) ]  |PARTITIONED|
>           group by ([$$3 := %0->$$39]) decor ([]) {
>                     aggregate [$$35] <- [function-call: asterix:agg-sum, 
> Args:[%0->$$38]]
>                     -- AGGREGATE  |LOCAL|
>                       nested tuple source
>                       -- NESTED_TUPLE_SOURCE  |LOCAL|
>                  }
>           -- PRE_CLUSTERED_GROUP_BY[$$39]  |PARTITIONED|
>             exchange 
>             -- HASH_PARTITION_MERGE_EXCHANGE MERGE:[$$39(ASC)] HASH:[$$39]  
> |PARTITIONED|
>               group by ([$$39 := %0->$$27]) decor ([]) {
>                         aggregate [$$38] <- [function-call: 
> asterix:agg-count, Args:[AInt64: {1}]]
>                         -- AGGREGATE  |LOCAL|
>                           nested tuple source
>                           -- NESTED_TUPLE_SOURCE  |LOCAL|
>                      }
>               -- SORT_GROUP_BY[$$27]  |PARTITIONED|
>                 exchange 
>                 -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                   project ([$$27])
>                   -- STREAM_PROJECT  |PARTITIONED|
>                     exchange 
>                     -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                       join (function-call: algebricks:eq, Args:[%0->$$30, 
> %0->$$31])
>                       -- HYBRID_HASH_JOIN [$$30][$$31]  |PARTITIONED|
>                         exchange 
>                         -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                           project ([$$27, $$30])
>                           -- STREAM_PROJECT  |PARTITIONED|
>                             select (function-call: algebricks:and, 
> Args:[function-call: algebricks:ge, Args:[%0->$$29, AString: {1993-07-01}], 
> function-call: algebricks:lt, Args:[%0->$$29, AString: {1993-10-01}]])
>                             -- STREAM_SELECT  |PARTITIONED|
>                               project ([$$27, $$29, $$30])
>                               -- STREAM_PROJECT  |PARTITIONED|
>                                 assign [$$27, $$29] <- [function-call: 
> asterix:field-access-by-index, Args:[%0->$$4, AInt32: {5}], function-call: 
> asterix:field-access-by-index, Args:[%0->$$4, AInt32: {4}]]
>                                 -- ASSIGN  |PARTITIONED|
>                                   exchange 
>                                   -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                                     unnest-map [$$30, $$4] <- function-call: 
> asterix:index-search, Args:[AString: {Orders}, AInt32: {0}, AString: 
> {tpch_450g}, AString: {Orders}, ABoolean: {false}, ABoolean: {false}, 
> ABoolean: {false}, AInt32: {1}, %0->$$43, AInt32: {1}, %0->$$43, TRUE, TRUE, 
> TRUE]
>                                     -- BTREE_SEARCH  |PARTITIONED|
>                                       exchange 
>                                       -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                                         order (ASC, %0->$$43) 
>                                         -- STABLE_SORT [$$43(ASC)]  
> |PARTITIONED|
>                                           exchange 
>                                           -- ONE_TO_ONE_EXCHANGE  
> |PARTITIONED|
>                                             project ([$$43])
>                                             -- STREAM_PROJECT  |PARTITIONED|
>                                               exchange 
>                                               -- ONE_TO_ONE_EXCHANGE  
> |PARTITIONED|
>                                                 unnest-map [$$42, $$43] <- 
> function-call: asterix:index-search, Args:[AString: {orders_orderdateIx}, 
> AInt32: {0}, AString: {tpch_450g}, AString: {Orders}, ABoolean: {false}, 
> ABoolean: {false}, ABoolean: {false}, AInt32: {1}, %0->$$40, AInt32: {1}, 
> %0->$$41, TRUE, FALSE, FALSE]
>                                                 -- BTREE_SEARCH  |PARTITIONED|
>                                                   exchange 
>                                                   -- ONE_TO_ONE_EXCHANGE  
> |PARTITIONED|
>                                                     assign [$$40, $$41] <- 
> [AString: {1993-07-01}, AString: {1993-10-01}]
>                                                     -- ASSIGN  |PARTITIONED|
>                                                       empty-tuple-source
>                                                       -- EMPTY_TUPLE_SOURCE  
> |PARTITIONED|
>                         exchange 
>                         -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                           distinct ([%0->$$31])
>                           -- PRE_SORTED_DISTINCT_BY  |PARTITIONED|
>                             exchange 
>                             -- HASH_PARTITION_MERGE_EXCHANGE 
> MERGE:[$$31(ASC)] HASH:[$$31]  |PARTITIONED|
>                               project ([$$31])
>                               -- STREAM_PROJECT  |PARTITIONED|
>                                 select (function-call: algebricks:lt, 
> Args:[function-call: asterix:field-access-by-index, Args:[%0->$$5, AInt32: 
> {11}], function-call: asterix:field-access-by-index, Args:[%0->$$5, AInt32: 
> {12}]])
>                                 -- STREAM_SELECT  |PARTITIONED|
>                                   project ([$$5, $$31])
>                                   -- STREAM_PROJECT  |PARTITIONED|
>                                     exchange 
>                                     -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                                       data-scan []<-[$$31, $$32, $$5] <- 
> tpch_450g:LineItem
>                                       -- DATASOURCE_SCAN  |PARTITIONED|
>                                         exchange 
>                                         -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
>                                           empty-tuple-source
>                                           -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
> {noformat}
> - Here are error logs from two NCs:
> from NC1:
> {noformat}
> INFO: Initializing TAID:TID:ANID:ODID:1:1:0:0 -> 
> [org.apache.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor$2@6b5870a9,
>  
> org.apache.hyracks.storage.am.btree.dataflow.BTreeSearchOperatorDescriptor@1306c1d9,
>  
> org.apache.hyracks.dataflow.std.join.OptimizedHybridHashJoinOperatorDescriptor$ProbeAndJoinActivityNode@a31e46f,
>  
> org.apache.hyracks.dataflow.std.group.sort.SortGroupByOperatorDescriptor$1@619ff47e,
>  Asterix { 
>   assign [2, 3] := 
> [org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@496a0ddc,
>  
> org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@6c471521];
>   stream-project [2, 3, 0];
>   stream-select 
> org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@69d0865a;
>   stream-project [0, 2];
> }, Asterix { 
>   stream-project [0];
> }]
> Jan 15, 2016 10:35:07 AM org.apache.hyracks.control.nc.work.StartTasksWork run
> INFO: Initializing TAID:TID:ANID:ODID:1:1:1:0 -> 
> [org.apache.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor$2@6b5870a9,
>  
> org.apache.hyracks.storage.am.btree.dataflow.BTreeSearchOperatorDescriptor@1306c1d9,
>  
> org.apache.hyracks.dataflow.std.join.OptimizedHybridHashJoinOperatorDescriptor$ProbeAndJoinActivityNode@a31e46f,
>  
> org.apache.hyracks.dataflow.std.group.sort.SortGroupByOperatorDescriptor$1@619ff47e,
>  Asterix { 
>   assign [2, 3] := 
> [org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@496a0ddc,
>  
> org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@6c471521];
>   stream-project [2, 3, 0];
>   stream-select 
> org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@69d0865a;
>   stream-project [0, 2];
> }, Asterix { 
>   stream-project [0];
> }]
> Jan 15, 2016 10:35:07 AM org.apache.hyracks.control.nc.work.StartTasksWork run
> INFO: Initializing TAID:TID:ANID:ODID:1:1:2:0 -> 
> [org.apache.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor$2@6b5870a9,
>  
> org.apache.hyracks.storage.am.btree.dataflow.BTreeSearchOperatorDescriptor@1306c1d9,
>  
> org.apache.hyracks.dataflow.std.join.OptimizedHybridHashJoinOperatorDescriptor$ProbeAndJoinActivityNode@a31e46f,
>  
> org.apache.hyracks.dataflow.std.group.sort.SortGroupByOperatorDescriptor$1@619ff47e,
>  Asterix { 
>   assign [2, 3] := 
> [org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@496a0ddc,
>  
> org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@6c471521];
>   stream-project [2, 3, 0];
>   stream-select 
> org.apache.hyracks.algebricks.core.algebra.expressions.LogicalExpressionJobGenToExpressionRuntimeProviderAdapter$ScalarEvaluatorFactoryAdapter@69d0865a;
>   stream-project [0, 2];
> }, Asterix { 
>   stream-project [0];
> }]
> org.apache.hyracks.api.exceptions.HyracksDataException: 
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:215)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
>       at org.apache.hyracks.control.nc.Task.run(Task.java:258)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: 
> java.lang.NullPointerException
>       at java.util.concurrent.FutureTask.report(FutureTask.java:122)
>       at java.util.concurrent.FutureTask.get(FutureTask.java:192)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:213)
>       ... 5 more
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hyracks.dataflow.std.sort.AbstractSorterOperatorDescriptor$MergeActivity$1.initialize(AbstractSorterOperatorDescriptor.java:183)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:204)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:201)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       ... 3 more
> org.apache.hyracks.api.exceptions.HyracksDataException: 
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:215)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
>       at org.apache.hyracks.control.nc.Task.run(Task.java:258)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: 
> java.lang.NullPointerException
>       at java.util.concurrent.FutureTask.report(FutureTask.java:122)
>       at java.util.concurrent.FutureTask.get(FutureTask.java:192)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:213)
>       ... 5 more
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hyracks.dataflow.std.sort.AbstractSorterOperatorDescriptor$MergeActivity$1.initialize(AbstractSorterOperatorDescriptor.java:183)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:204)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:201)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       ... 3 more
> org.apache.hyracks.api.exceptions.HyracksDataException: 
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:215)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
>       at org.apache.hyracks.control.nc.Task.run(Task.java:258)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: 
> java.lang.NullPointerException
>       at java.util.concurrent.FutureTask.report(FutureTask.java:122)
>       at java.util.concurrent.FutureTask.get(FutureTask.java:192)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:213)
>       ... 5 more
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hyracks.dataflow.std.sort.AbstractSorterOperatorDescriptor$MergeActivity$1.initialize(AbstractSorterOperatorDescriptor.java:183)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:204)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:201)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       ... 3 more  
> {noformat}
> From NC2:
> {noformat}
> org.apache.hyracks.api.exceptions.HyracksDataException: 
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:215)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
>       at org.apache.hyracks.control.nc.Task.run(Task.java:258)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: 
> java.lang.NullPointerException
>       at java.util.concurrent.FutureTask.report(FutureTask.java:122)
>       at java.util.concurrent.FutureTask.get(FutureTask.java:192)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:213)
>       ... 5 more
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hyracks.dataflow.std.sort.AbstractSorterOperatorDescriptor$MergeActivity$1.initialize(AbstractSorterOperatorDescriptor.java:183)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:204)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:201)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       ... 3 more
> org.apache.hyracks.api.exceptions.HyracksDataException: 
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:215)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
>       at org.apache.hyracks.control.nc.Task.run(Task.java:258)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: 
> java.lang.NullPointerException
>       at java.util.concurrent.FutureTask.report(FutureTask.java:122)
>       at java.util.concurrent.FutureTask.get(FutureTask.java:192)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:213)
>       ... 5 more
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hyracks.dataflow.std.sort.AbstractSorterOperatorDescriptor$MergeActivity$1.initialize(AbstractSorterOperatorDescriptor.java:183)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:204)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:201)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       ... 3 more
> Jan 15, 2016 10:35:08 AM 
> org.apache.hyracks.control.common.work.WorkQueue$WorkerThread run
> INFO: Executing: NotifyTaskFailure
> org.apache.hyracks.api.exceptions.HyracksDataException: 
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:215)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
>       at org.apache.hyracks.control.nc.Task.run(Task.java:258)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: 
> java.lang.NullPointerException
>       at java.util.concurrent.FutureTask.report(FutureTask.java:122)
>       at java.util.concurrent.FutureTask.get(FutureTask.java:192)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:213)
>       ... 5 more
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hyracks.dataflow.std.sort.AbstractSorterOperatorDescriptor$MergeActivity$1.initialize(AbstractSorterOperatorDescriptor.java:183)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:204)
>       at 
> org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:201)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       ... 3 more
> {noformat}



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