Eliminated memory leak when converting a third party data frame to one

used internally by the driver (#561).

Author: anthony-tuininga

doc/src/release_notes.rst

@@ -42,6 +42,9 @@ Common Changes
     (`issue 554 <https://github.com/oracle/python-oracledb/issues/554>`__).
 #)  Fixed regression with contents of :data:`Cursor.description` when calling
     :meth:`Cursor.parse()` with a query that returns LOBs.
+#)  Eliminated memory leak when converting a third party data frame to one used
+    internally by the driver
+    (`issue 561 <https://github.com/oracle/python-oracledb/issues/561>`__).
 #)  Fixed bug causing hang when using :ref:`asyncio <concurrentprogramming>`
     and the database closes the connection before the connection is returned to
     the user.

src/oracledb/impl/arrow/dataframe.pyx

@@ -1,5 +1,5 @@
 #------------------------------------------------------------------------------
-# Copyright (c) 2025, Oracle and/or its affiliates.
+# Copyright (c) 2025, 2026, Oracle and/or its affiliates.
 #
 # This software is dual-licensed to you under the Universal Permissive License
 # (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
@@ -71,6 +71,7 @@ cdef class DataFrameImpl:
                 array_impl.populate_from_array(df_impl.schema_impls[i],
                                                arrow_array.children[i])
                 df_impl.arrays.append(array_impl)
+            ArrowArrayRelease(&arrow_array)
 
         ArrowArrayStreamRelease(arrow_stream)
         return df_impl