Sqlalchemy-hana

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Features
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- ``sqlalchemy.func.now`` will be rendered as ``CURRENT_TIMESTAMP``

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Features
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- ``sqlalchemy_hana.errors`` will now raise a ``WriteInReadOnlyReplicationError`` error for error
messages indicating a write statement in a read-only replication

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Features
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- Added basic JSON support (contributed by Zahlii)
- ``sqlalchemy_hana.errors`` will now raise a ``DatabaseConnectNotPossibleError`` error for hdbcli
error code ``1888``

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Features
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- Add error handling for SAP HANA Cloud region maintenance error
- Add additional caching to reflection methods (contributed by Masterchen09)

Bugfixes
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- Fixed an issue causing ``get_table_oid`` to fails of the inspector
was created based on an engine (contributed by Masterchen09)

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Breaking Changes
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Reworked the ``sqlalchemy_hana.errors`` package so that it can be used inside a SQLAlchemy
``handle_error`` event hook. Therefore

- ``wrap_dbapi_error`` was removed
- ``wrap_hdbcli_error`` was removed
- ``HANAError`` now extends ``sqlalchemy.exc.DBAPIError``

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Features
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- Support ``Identity`` columns
- Support additional cases for ``StatementExecutionError``