maropu commented on a change in pull request #29837:
URL: https://github.com/apache/spark/pull/29837#discussion_r499217171
##########
File path: docs/sql-ref-datatypes.md
##########
@@ -314,3 +314,49 @@ SELECT COUNT(*), c2 FROM test GROUP BY c2;
| 3| Infinity|
+---------+---------+
```
+
+#### Data type compatibility
+
+The following is the hierarchy of data type compatibility and the possible
implicit conversions that can be made. In an operation involving different and
compatible data types, these will be promoted to the lowest common top type to
perform the operation.
Review comment:
The current description looks ambiguous and many topics get mixed up, I
think. What's the topics you would like to describe in this section? If you
want to describe type conversion with the default mode (ansi=false), I think we
need to pick up three categories: [explicit casting, type coercion, and store
assignment
casting](https://spark.apache.org/docs/latest/sql-ref-ansi-compliance.html#type-conversion).
Anyway, we need a clearer structure to describe type behaviours for
easy-to-read user documents.
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