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ebyhr merged 1 commit into from
Aug 18, 2022
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Improve type mapping documentation for Oracle connector #13659

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17 changes: 11 additions & 6 deletions docs/src/main/sphinx/connector/oracle.rst
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Expand Up @@ -131,18 +131,19 @@ To access the clicks table in the web database, run the following::
Type mapping
------------

Both Oracle and Trino have types that are not supported by the Oracle
connector. The following sections explain their type mapping.
Because Trino and Oracle each support types that the other does not, this
connector modifies some types when reading or writing data. Data types may not
map the same way in both directions between Trino and the data source. Refer to
the following sections for type mapping in each direction.

Oracle to Trino type mapping
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Trino supports selecting Oracle database types. This table shows the Oracle to
Trino data type mapping:


.. list-table:: Oracle to Trino type mapping
:widths: 20, 20, 60
:widths: 30, 25, 50
:header-rows: 1

* - Oracle database type
Expand Down Expand Up @@ -200,6 +201,8 @@ Trino data type mapping:
- ``TIMESTAMP WITH TIME ZONE``
- See :ref:`datetime mapping`

No other types are supported.

Trino to Oracle type mapping
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Expand All @@ -209,10 +212,10 @@ The table shows the mappings from Trino to Oracle data types:
.. note::
For types not listed in the table below, Trino can't perform the ``CREATE
TABLE <table> AS SELECT`` operations. When data is inserted into existing
tables ``Oracle to Trino`` type mapping is used.
tables, ``Oracle to Trino`` type mapping is used.

.. list-table:: Trino to Oracle Type Mapping
:widths: 20, 20, 60
:widths: 30, 25, 50
:header-rows: 1

* - Trino type
Expand Down Expand Up @@ -261,6 +264,8 @@ The table shows the mappings from Trino to Oracle data types:
- ``TIMESTAMP(3) WITH TIME ZONE``
- See :ref:`datetime mapping`

No other types are supported.

.. _number mapping:

Mapping numeric types
Expand Down