Spark: incorrect results when column stats are fetched

there are some result set differences when column stats fetch is enabled w.r.t to llap outputs. Examples:

+++ ql/src/test/results/clientpositive/spark/union_remove_12.q.out
-       totalSize               194                 
+       totalSize               192                 
+       18
+       18
+       28
+       28
-8      18
-8      18
-8      28
-8      28

+++ ql/src/test/results/clientpositive/spark/vectorized_nested_mapjoin.q.out
-6.06519093248863E11
+5.744447909695194E9

ql/src/test/results/clientpositive/spark/union_remove_12.q.out
ql/src/test/results/clientpositive/spark/union_remove_13.q.out
ql/src/test/results/clientpositive/spark/union_remove_14.q.out
ql/src/test/results/clientpositive/spark/bucket_map_join_tez1.q.out
ql/src/test/results/clientpositive/spark/join32.q.out
ql/src/test/results/clientpositive/spark/join33.q.out
ql/src/test/results/clientpositive/spark/vectorized_nested_mapjoin.q.out