Added preliminary support for fetching data as Apache Arrow arrays with

zero copy interchange with popular data frame libraries (#375).

Author: anthony-tuininga

.gitignore

@@ -6,6 +6,10 @@ build/
 dist/
 doc/build
 src/oracledb/*.c
+src/oracledb/interchange/*.c
 tests/ext/config.ini
 .ipynb_checkpoints/
+.venv*/
+.idea
 samples/sample.csv
+samples/sample.parquet

THIRD_PARTY_LICENSES.txt

@@ -453,3 +453,247 @@ GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+___________________________________________________________________________________________
+
+Apache Arrow nanoarrow
+Copyright 2023 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+
+----------
+
+
+
+Apache nanoarrow 0.6.0
+
+
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doc/src/api_manual/connection.rst

@@ -128,6 +128,61 @@ Connection Methods
 
     .. versionadded:: 2.1.0
 
+.. method:: Connection.fetch_df_all(statement, parameters=None, \
+            arraysize=None)
+
+    Fetches all rows of the SQL query ``statement``, returning them in an
+    :ref:`OracleDataFrame <oracledataframeobj>` object. An empty
+    OracleDataFrame is returned if there are no rows available.
+
+    The ``parameters`` parameter can be a list of tuples, where each tuple item
+    maps to one :ref:`bind variable placeholder <bind>` in ``statement``. It
+    can also be a list of dictionaries, where the keys match the bind variable
+    placeholder names in ``statement``.
+
+    The ``arraysize`` parameter can specified to tune performance of fetching
+    data across the network. It defaults to :attr:`defaults.arraysize`.
+    Internally, the ``fetch_df_all()``'s :attr:`Cursor.prefetchrows` size is
+    always set to the value of the explicit or default ``arraysize`` parameter
+    value.
+
+    See :ref:`dataframeformat` for the supported data types and examples.
+
+    .. note::
+
+        The data frame support in python-oracledb 3.0.0 is a pre-release and
+        may change in the next version.
+
+    .. versionadded:: 3.0.0
+
+.. method:: Connection.fetch_df_batches(statement, parameters=None, \
+            size=None)
+
+    This returns an iterator yielding the next ``size`` rows of the SQL query
+    ``statement`` in each iteration as an :ref:`OracleDataFrame
+    <oracledataframeobj>` object. An empty OracleDataFrame is returned if there
+    are no rows available.
+
+    The ``parameters`` parameter can be a list of tuples, where each tuple item
+    maps to one :ref:`bind variable placeholder <bind>` in ``statement``. It
+    can also be a list of dictionaries, where the keys match the bind variable
+    placeholder names in ``statement``.
+
+    The ``size`` parameter controls the number of records fetched in each
+    batch. It defaults to :attr:`defaults.arraysize`. Internally, the
+    ``fetch_df_batches()``'s :attr:`Cursor.arraysize`. and
+    :attr:`Cursor.prefetchrows` sizes are always set to the value of the
+    explicit or default ``size`` parameter value.
+
+    See :ref:`dataframeformat` for the supported data types and examples.
+
+    .. note::
+
+        The data frame support in python-oracledb 3.0.0 is a pre-release and
+        may change in the next version.
+
+    .. versionadded:: 3.0.0
+
 .. method:: Connection.getSodaDatabase()
 
     Returns a :ref:`SodaDatabase <sodadb>` object for Simple Oracle Document