Univariate stats over 10Kx1K w/ wrong optimizer choice

Total elapsed time:		38.600 sec.
Total compilation time:		1.978 sec.
Total execution time:		36.622 sec.
Number of compiled Spark inst:	1.
Number of executed Spark inst:	1.
Cache hits (Mem, WB, FS, HDFS):	4/0/0/426.
Cache writes (WB, FS, HDFS):	2/0/2.
Cache times (ACQr/m, RLS, EXP):	3.799/0.001/0.006/0.341 sec.
HOP DAGs recompiled (PRED, SB):	0/0.
HOP DAGs recompile time:	0.000 sec.
Spark ctx create time (lazy):	21.545 sec.
Spark trans counts (par,bc,col):0/0/0.
Spark trans times (par,bc,col):	0.000/0.000/0.000 secs.
ParFor loops optimized:		1.
ParFor optimize time:		0.076 sec.
ParFor initialize time:		0.000 sec.
ParFor result merge time:	8.191 sec.
ParFor total update in-place:	0/0/0
Total JIT compile time:		26.803 sec.
Total JVM GC count:		8.
Total JVM GC time:		0.87 sec.
Heavy hitter instructions:
  #  Instruction  Time(s)  Count
  1  ParFor-ESP    26.999      1
  2  uacmax         0.762      1
  3  >              0.184      1
  4  write          0.102      1
  5  rand           0.006      1
  6  -              0.001      4
  7  *              0.001      5
  8  mvvar          0.000     23
  9  uamax          0.000      1
 10  rmvar          0.000      6