Commits
Joris Van den Bossche authored and Krisztián Szűcs committed 0449ea7492f
ARROW-8186: [Python] Fix dataset expression operation with invalid scalar When the expression operation is invalid, we should raise an error rather than returning a non-expression object. Closes #6700 from jorisvandenbossche/ARROW-8186 Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>