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RELEASE_NOTES.txt
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=======================================
Release notes for PyTables 3.2 series
=======================================
:Author: PyTables Developers
:Contact: [email protected]
.. py:currentmodule:: tables
Changes from 3.2.1 to xxxxx
===========================
Improvements
------------
- It is now possible to remove all rows from a table.
- It is now possible to read reference types by dereferencing them as
numpy array of objects (closes :issue:`518` and :issue:`519`).
Thanks to Ehsan Azar
- It is now also possible to use HDF5 with the new shared library naming
scheme (>= 1.8.10, hdf5.dll instead of hdf5dll.dll) on Windows (:issue:`540`).
- Get rid of the `-native` compile flag (closes :issue:`503`)
- The default number of threads to run numexpr (MAX_NUMEXPR_THREADS)
internally has been raised from 2 to 4. This is because we are in
2016 and 4 core configurations are becoming common.
- Internal Blosc version updated to 1.8.1 (closes :issue:`541`)
- Full BitShuffle support for new Blosc versions (>= 1.8).
- In order to avoid locking issues when using PyTables concurrently in
several process, MAX_BLOSC_THREADS has been set to 1 by default. If
you are running PyTables in one single process, you may want to
experiment if higher values (like 2 or 4) bring better performance for
you.
Bugs fixed
----------
- Only run `tables.tests.test_basics.UnicodeFilename` if the filesystem
encoding is utf-8. Closes :issue:`485`.
- Fix segmentation fault in a number of test cases that use
:class:`index.Index` (closes :issue:`532` and :issue:`533`).
Thanks to Diane Trout.
- Fixed the evaluation of transcendental functions when numexpr is
compiled with VML support (closes :issue:`534`, PR #536).
Thanks to Tom Kooij.
- Make sure that index classes use buffersizes that are a multiple
of chunkshape[0] (closes :issue:`538`, PR #538).
Thanks to Tom Kooij.
Other changes
-------------
- Minimum Cython_ version is now v0.21
.. _Cython: http://cython.org
Changes from 3.2.1.1 to 3.2.2
=============================
Bug fixed
---------
- Fix AssertionError in Row.__init_loop. See :issue:`477`.
- Fix issues with Cython 0.23. See :issue:`481`.
- Only run `tables.tests.test_basics.UnicodeFilename` if the filesystem
encoding is utf-8. Closes :issue:`485`.
- Fix missing missing PyErr_Clear. See :issue:`#486`.
- Fix the C type of some numpy attributes. See :issue:`494`.
- Cast selection indices to integer. See :issue:`496`.
- Fix indexesextension._keysort_string. Closes :issue:`497` and :issue:`498`.
Changes from 3.2.1 to 3.2.1.1
=============================
- Fix permission on distributed source distribution
Changes from 3.2.0 to 3.2.1
===========================
Bug fixed
---------
- Fix indexesextension._keysort. Fixes :issue:`455`. Thanks to Andrew Lin.
Changes from 3.1.1 to 3.2.0
===========================
Improvements
------------
- The `nrowsinbuf` is better computed now for EArray/CArray having
a small `chunkshape` in the main dimension. Fixes #285.
- PyTables should be installable very friendly via pip, including NumPy
being installed automatically in the unlikely case it is not yet
installed in the system. Thanks to Andrea Bedini.
- setup.py has been largely simplified and now it requires *setuptools*.
Although we think this is a good step, please keep us informed this is
breaking some installation in a very bad manner.
- setup.py now is able to used *pkg-config*, if available, to locate required
libraries (hdf5, bzip2, etc.). The use of *pkg-config* can be controlled
via setup.py command line flags or via environment variables.
Please refer to the installation guide (in the *User Manual*) for details.
Closes :issue:`442`.
- It is now possible to create a new node whose parent is a softlink to another
group (see :issue:`422`). Thanks to Alistair Muldal.
- :class:`link.SoftLink` objects no longer need to be explicitly dereferenced.
Methods and attributes of the linked object are now automatically accessed
when the user acts on a soft-link (see :issue:`399`).
Thanks to Alistair Muldal.
- Now :program:`ptrepack` recognizes hardlinks and replicates them in the
output (*repacked*) file. This saves disk space and makes repacked files
more conformal to the original one. Closes :issue:`380`.
- New :program:`pttree` script for printing HDF5 file contents as a pretty
ASCII tree (closes :issue:`400`). Thanks to Alistair Muldal.
- The internal Blosc library has been downgraded to version 1.4.4. This
is in order to still allow using multiple threads *inside* Blosc, even
on multithreaded applications (see :issue:`411`, :issue:`412`,
:issue:`437` and :issue:`448`).
- The :func:`print_versions` function now also reports the version of
compression libraries used by Blosc.
- Now the :file:`setup.py` tries to use the '-march=native' C flag by
default. In falls back on '-msse2' if '-march=native' is not supported
by the compiler. Closes :issue:`379`.
- Fixed a spurious unicode comparison warning (closes :issue:`372` and
:issue:`373`).
- Improved handling of empty string attributes. In previous versions of
PyTables empty string were stored as scalar HDF5 attributes having size 1
and value '\0' (an empty null terminated string).
Now empty string are stored as HDF5 attributes having zero size
- Added a new cookbook recipe and a couple of examples for simple threading
with PyTables.
- The redundant :func:`utilsextension.get_indices` function has been
eliminated (replaced by :meth:`slice.indices`). Closes :issue:`195`.
- Allow negative indices in point selection (closes :issue:`360`)
- Index wasn't being used if it claimed there were no results.
Closes :issue:`351` (see also :issue:`353`)
- Atoms and Col types are no longer generated dynamically so now it is easier
for IDEs and static analysis tool to handle them (closes :issue:`345`)
- The keysort functions in idx-opt.c have been cythonised using fused types.
The perfomance is mostly unchanged, but the code is much more simpler now.
Thanks to Andrea Bedini.
- Small unit tests re-factoring:
* :func:`print_versions` and :func:`tests.common.print_heavy` functions
moved to the :mod:`tests.common` module
* always use :func:`print_versions` when test modules are called as scripts
* use the unittest2_ package in Python 2.6.x
* removed internal machinery used to replicate unittest2_ features
* always use :class:`tests.common.PyTablesTestCase` as base class for all
test cases
* code of the old :func:`tasts.common.cleanup` function has been moved to
:meth:`tests.common.PyTablesTestCase.tearDown` method
* new implementation of :meth:`tests.common.PyTablesTestCase.assertWarns`
compatible with the one provided by the standard :mod:`unittest` module
in Python >= 3.2
* use :meth:`tests.common.PyTablesTestCase.assertWarns` as context manager
when appropriate
* use the :func:`unittest.skipIf` decorator when appropriate
* new :class:tests.comon.TestFileMixin: class
.. _unittest2: https://pypi.python.org/pypi/unittest2
Bugs fixed
----------
- Fixed compatibility problems with numpy 1.9 and 1.10-dev
(closes :issue:`362` and :issue:`366`)
- Fixed compatibility with Cython >= 0.20 (closes :issue:`386` and
:issue:`387`)
- Fixed support for unicode node names in LRU cache (only Python 2 was
affected). Closes :issue:`367` and :issue:`369`.
- Fixed support for unicode node titles (only Python 2 was affected).
Closes :issue:`370` and :issue:`374`.
- Fixed a bug that caused the silent truncation of unicode attributes
containing the '\0' character. Closes :issue:`371`.
- Fixed :func:`descr_from_dtype` to work as expected with complex types.
Closes :issue:`381`.
- Fixed the :class:`tests.test_basics.ThreadingTestCase` test case.
Closes :issue:`359`.
- Fix incomplete results when performing the same query twice and exhausting
the second iterator before the first. The first one writes incomplete
results to *seqcache* (:issue:`353`)
- Fix false results potentially going to *seqcache* if
:meth:`tableextension.Row.update` is used during iteration
(see :issue:`353`)
- Fix :meth:`Column.create_csindex` when there's NaNs
- Fixed handling of unicode file names on windows (closes :issue:`389`)
- No longer not modify :data:`sys.argv` at import time (closes :issue:`405`)
- Fixed a performance issue on NFS (closes :issue:`402`)
- Fixed a nasty problem affecting results of indexed queries.
Closes :issue:`319` and probably :issue:`419` too.
- Fixed another problem affecting results of indexed queries too.
Closes :issue:`441`.
- Replaced "len(xrange(start, stop, step))" -> "len(xrange(0, stop -
start, step))" to fix issues with large row counts with Python 2.x.
Fixes #447.
Other changes
-------------
- Cython is not a hard dependency anymore (although developers will need it
so as to generated the C extension code).
- The number of threads used by default for numexpr and Blosc operation that
was set to the number of available cores have been reduced to 2. This is
a much more reasonable setting for not creating too much overhead.
**Enjoy data!**
-- The PyTables Developers
.. Local Variables:
.. mode: rst
.. coding: utf-8
.. fill-column: 72
.. End: