Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/22746#discussion_r225783658
--- Diff: docs/sql-reference.md ---
@@ -0,0 +1,641 @@
+---
+layout: global
+title: Reference
+displayTitle: Reference
+---
+
+* Table of contents
+{:toc}
+
+## Data Types
+
+Spark SQL and DataFrames support the following data types:
+
+* Numeric types
+ - `ByteType`: Represents 1-byte signed integer numbers.
--- End diff --
nit: use 2 space indent.
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