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PERF: perf improvements in single-dtyped indexing (GH6484) #6486

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Merged
merged 1 commit into from
Feb 27, 2014
Merged

PERF: perf improvements in single-dtyped indexing (GH6484) #6486

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1 change: 1 addition & 0 deletions doc/source/release.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -129,6 +129,7 @@ Improvements to existing features
using ``DataFrame.to_csv`` (:issue:`5414`, :issue:`4528`)
- perf improvements in DataFrame construction with certain offsets, by removing faulty caching
(e.g. MonthEnd,BusinessMonthEnd), (:issue:`6479`)
- perf improvements in single-dtyped indexing (:issue:`6484`)

.. _release.bug_fixes-0.14.0:

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5 changes: 4 additions & 1 deletion pandas/core/internals.py
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Expand Up @@ -3402,8 +3402,11 @@ def reindex_items(self, new_items, indexer=None, copy=True,
# unique
if self.axes[0].is_unique and new_items.is_unique:

# ok to use the global indexer if only 1 block
i = indexer if len(self.blocks) == 1 else None

for block in self.blocks:
blk = block.reindex_items_from(new_items, copy=copy)
blk = block.reindex_items_from(new_items, indexer=i, copy=copy)
new_blocks.extend(_valid_blocks(blk))

# non-unique
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