REF/INT: preserve block type in joining when only having a single block#17954

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TomAugspurger merged 4 commits intopandas-dev:masterfrom

jorisvandenbossche:internals-concat-axis1

Oct 27, 2017

Commits on Oct 23, 2017

REF/INT: preserve block type in joining when only having a single block
jorisvandenbossche
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Commits on Oct 24, 2017

Commits on Oct 27, 2017

clean-up comment
jorisvandenbossche
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