HIVE-29432: Addendum to fix failing parquet_types_vectorization.q (apache#6446)

Author: thomasrebele

ql/src/test/results/clientpositive/llap/parquet_types_vectorization.q.out

@@ -736,16 +736,16 @@ STAGE PLANS:
                     Group By Operator
                       aggregations: count()
                       keys: t (type: timestamp)
-                      minReductionHashAggr: 0.99
+                      minReductionHashAggr: 0.4
                       mode: hash
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 11 Data size: 528 Basic stats: COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 22 Data size: 1056 Basic stats: COMPLETE Column stats: COMPLETE
                       Reduce Output Operator
                         key expressions: _col0 (type: timestamp)
                         null sort order: z
                         sort order: +
                         Map-reduce partition columns: _col0 (type: timestamp)
-                        Statistics: Num rows: 11 Data size: 528 Basic stats: COMPLETE Column stats: COMPLETE
+                        Statistics: Num rows: 22 Data size: 1056 Basic stats: COMPLETE Column stats: COMPLETE
                         value expressions: _col1 (type: bigint)
             Execution mode: vectorized, llap
             LLAP IO: all inputs (cache only)
@@ -757,23 +757,23 @@ STAGE PLANS:
                 keys: KEY._col0 (type: timestamp)
                 mode: mergepartial
                 outputColumnNames: _col0, _col1
-                Statistics: Num rows: 5 Data size: 240 Basic stats: COMPLETE Column stats: COMPLETE
+                Statistics: Num rows: 22 Data size: 1056 Basic stats: COMPLETE Column stats: COMPLETE
                 Reduce Output Operator
                   key expressions: _col0 (type: timestamp)
                   null sort order: z
                   sort order: +
-                  Statistics: Num rows: 5 Data size: 240 Basic stats: COMPLETE Column stats: COMPLETE
+                  Statistics: Num rows: 22 Data size: 1056 Basic stats: COMPLETE Column stats: COMPLETE
                   value expressions: _col1 (type: bigint)
         Reducer 3 
             Execution mode: vectorized, llap
             Reduce Operator Tree:
               Select Operator
                 expressions: KEY.reducesinkkey0 (type: timestamp), VALUE._col0 (type: bigint)
                 outputColumnNames: _col0, _col1
-                Statistics: Num rows: 5 Data size: 240 Basic stats: COMPLETE Column stats: COMPLETE
+                Statistics: Num rows: 22 Data size: 1056 Basic stats: COMPLETE Column stats: COMPLETE
                 File Output Operator
                   compressed: false
-                  Statistics: Num rows: 5 Data size: 240 Basic stats: COMPLETE Column stats: COMPLETE
+                  Statistics: Num rows: 22 Data size: 1056 Basic stats: COMPLETE Column stats: COMPLETE
                   table:
                       input format: org.apache.hadoop.mapred.SequenceFileInputFormat
                       output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat