yaooqinn commented on code in PR #46092:
URL: https://github.com/apache/spark/pull/46092#discussion_r1568168654
##########
docs/sql-data-sources-jdbc.md:
##########
@@ -1335,3 +1335,109 @@ as the activated JDBC Driver.
</tr>
</tbody>
</table>
+
+### Mapping Spark SQL Data Types to Oracle
+
+The below table describes the data type conversions from Spark SQL Data Types
to Oracle data types,
+when creating, altering, or writing data to an Oracle table using the built-in
jdbc data source with
+the Oracle JDBC as the activated JDBC Driver.
+
+<table>
+ <thead>
+ <tr>
+ <th><b>Spark SQL Data Type</b></th>
+ <th><b>Oracle Data Type</b></th>
+ <th><b>Remarks</b></th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>BooleanType</td>
+ <td>NUMBER(1, 0)</td>
+ <td>BooleanType maps to NUMBER(1, 0) as BOOLEAN is introduced since
Oracle Release 23c</td>
+ </tr>
+ <tr>
+ <td>ByteType</td>
+ <td>NUMBER(3)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>ShortType</td>
+ <td>NUMBER(5)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>IntegerType</td>
+ <td>NUMBER(10)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>LongType</td>
+ <td>NUMBER(19)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>FloatType</td>
+ <td>NUMBER(19, 4)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>DoubleType</td>
+ <td>NUMBER(19, 4)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>DecimalType(p, s)</td>
+ <td>NUMBER(p,s)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>DateType</td>
+ <td>DATE</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>TimestampType</td>
+ <td>TIMESTAMP WITH LOCAL TIME ZONE</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>TimestampNTZType</td>
+ <td>TIMESTAMP</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>StringType</td>
+ <td>VARCHAR2(255)</td>
+ <td>For historical reason, a string value has maximum 255 characters</td>
+ </tr>
+ <tr>
+ <td>BinaryType</td>
+ <td>BLOB</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>CharType(n)</td>
+ <td>CHAR(n)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>VarcharType(n)</td>
+ <td>VARCHAR2(n)</td>
Review Comment:
It's VARCHAR2 after #46091
It does not make any difference to the users, so I didn't add any remarks as
less is more.
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