Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/22121#discussion_r211773604
--- Diff: docs/avro-data-source-guide.md ---
@@ -0,0 +1,260 @@
+---
+layout: global
+title: Apache Avro Data Source Guide
+---
+
+* This will become a table of contents (this text will be scraped).
+{:toc}
+
+Since Spark 2.4 release, [Spark
SQL](https://spark.apache.org/docs/latest/sql-programming-guide.html) provides
built-in support for reading and writing Apache Avro data.
+
--- End diff --
note I think we should add a compatibility section here, reference
https://github.com/apache/spark/pull/22133
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