Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18853#discussion_r155364153
--- Diff: docs/sql-programming-guide.md ---
@@ -1490,6 +1490,16 @@ that these options will be deprecated in future
release as more optimizations ar
Configures the number of partitions to use when shuffling data for
joins or aggregations.
</td>
</tr>
+ <tr>
+ <td><code>spark.sql.typeCoercion.mode</code></td>
+ <td><code>default</code></td>
+ <td>
+ The <code>default</code> type coercion mode was used in spark prior
to 2.3.0, and so it
+ continues to be the default to avoid breaking behavior. However, it
has logical
+ inconsistencies. The <code>hive</code> mode is preferred for most
new applications, though
+ it may require additional manual casting.
--- End diff --
> Since Spark 2.3, the <code>hive</code> mode is introduced for Hive
compatiblity. Spark SQL has its native type cocersion mode, which is enabled by
default.
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