Commits
Uwe L. Korn authored and Krisztián Szűcs committed 62202ee14e9
ARROW-6339: [Python] Raise ValueError when accessing unset statistics Closes #5403 from xhochy/ARROW-6339 and squashes the following commits: 69a4fc2c1 <Uwe L. Korn> Return None instead of raising exception 457ad7149 <Uwe L. Korn> ARROW-6339: Raise ValueError when accessing unset statistics Authored-by: Uwe L. Korn <uwe.korn@quantco.com> Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>