Github user ambauma commented on the issue:
https://github.com/apache/spark/pull/19528
Able to duplicate. Working theory is that this is related to numpy 1.12.1.
Here is my conda env:
(spark-1.6) andrew@andrew-Inspiron-7559:~/git/spark$ conda list
# packages in environment at /home/andrew/.conda/envs/spark-1.6:
#
ca-certificates 2017.08.26 h1d4fec5_0
certifi 2016.2.28 py34_0
intel-openmp 2018.0.0 h15fc484_7
libedit 3.1 heed3624_0
libffi 3.2.1 h4deb6c0_3
libgcc-ng 7.2.0 h7cc24e2_2
libgfortran 1.0 0
libstdcxx-ng 7.2.0 h7a57d05_2
mkl 2017.0.3 0
ncurses 6.0 h06874d7_1
numpy 1.12.1 py34_0
openblas 0.2.19 0
openssl 1.0.2l h077ae2c_5
pip 9.0.1 py34_1
python 3.4.5 0
readline 6.2 2
setuptools 27.2.0 py34_0
sqlite 3.13.0 0
tk 8.5.18 0
wheel 0.29.0 py34_0
xz 5.2.3 h2bcbf08_1
zlib 1.2.11 hfbfcf68_1
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