cloud-fan commented on a change in pull request #29837:
URL: https://github.com/apache/spark/pull/29837#discussion_r517125806
##########
File path: docs/sql-ref-datatypes.md
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@@ -314,3 +314,206 @@ SELECT COUNT(*), c2 FROM test GROUP BY c2;
| 3| Infinity|
+---------+---------+
```
+
+### Type Conversion
+
+In general, an expression can contain different data types and type conversion
is the transformation of some data types into others in order to resolve type
mismatches.
Review comment:
```
Type conversion turns the values of one data type to another data type.
Spark needs to perform
type conversions if users explicitly ask to do so via the CAST operator, or
to resolve data type
mismatch in operators, functions, and table writing implicitly.
```
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