[SPARK-27276][PYTHON][SQL] Increase minimum version of pyarrow to 0.12.1 and remove prior workarounds#24298

Closed

BryanCutler wants to merge 3 commits intoapache:masterfrom BryanCutler:arrow-bump-min-pyarrow-SPARK-27276

+67-218

Commits on Apr 9, 2019