HIVE-29574: test fix

Author: illiabarbashov-sketch

ql/src/test/results/clientnegative/mergejoin_skew_abort_union_joins.q.out

@@ -96,7 +96,7 @@ Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Data skew detected
 #### A masked pattern was here ####
 ]], Vertex did not succeed due to OWN_TASK_FAILURE, failedTasks:1 killedTasks:0, Vertex vertex_#ID# [Reducer 7] killed/failed due to:OWN_TASK_FAILURE]
 [Masked Vertex killed due to OTHER_VERTEX_FAILURE]
-DAG did not succeed due to VERTEX_FAILURE. failedVertices:1 killedVertices:1
+DAG did not succeed due to VERTEX_FAILURE. failedVertices:1 killedVertices:2
 FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.tez.TezTask. Vertex failed, vertexName=Reducer 7, vertexId=vertex_#ID#, diagnostics=[Task failed, taskId=task_#ID#, diagnostics=[TaskAttempt 0 failed, info=[Error: Error while running task ( failure ) : attempt_#ID#:java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row
 #### A masked pattern was here ####
 Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row