REF: Consolidate alignment calls in DataFrame ops#28638

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jreback merged 3 commits intopandas-dev:masterfrom

jbrockmendel:after

Oct 2, 2019

Commits on Sep 26, 2019

REF: simplify _combine_series_frame, unify align calls
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REF: push back _construct_result call
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Merge branch 'master' of https://github.com/pandas-dev/pandas into after
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