add whatsnew

Nico Cernek · Nico Cernek · commit 7ccebb2a0437 · 2019-12-31T20:16:27.000-06:00
diff --git a/doc/source/whatsnew/v1.0.0.rst b/doc/source/whatsnew/v1.0.0.rst
@@ -949,6 +949,7 @@ Reshaping
 - Bug in :func:`melt` where supplying mixed strings and numeric values for ``id_vars`` or ``value_vars`` would incorrectly raise a ``ValueError`` (:issue:`29718`)
 - Dtypes are now preserved when transposing a ``DataFrame`` where each column is the same extension dtype (:issue:`30091`)
 - Bug in :func:`merge_asof` merging on a tz-aware ``left_index`` and ``right_on`` a tz-aware column (:issue:`29864`)
+- :meth:`DataFrame.merge` now preserves right frame's row order when executing a right merge (:issue:`27453`)
 -
 
 Sparse

Original file line number	Diff line number	Diff line change
`@@ -949,6 +949,7 @@ Reshaping`
`949`	`949`	- Bug in :func:`melt` where supplying mixed strings and numeric values for ``id_vars`` or ``value_vars`` would incorrectly raise a ``ValueError`` (:issue:`29718`)
`950`	`950`	- Dtypes are now preserved when transposing a ``DataFrame`` where each column is the same extension dtype (:issue:`30091`)
`951`	`951`	- Bug in :func:`merge_asof` merging on a tz-aware ``left_index`` and ``right_on`` a tz-aware column (:issue:`29864`)
	`952`	+- :meth:`DataFrame.merge` now preserves right frame's row order when executing a right merge (:issue:`27453`)
`952`	`953`	`-`
`953`	`954`
`954`	`955`	`Sparse`