Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22814#discussion_r228113346
--- Diff: docs/sql-migration-guide-upgrade.md ---
@@ -10,6 +10,9 @@ displayTitle: Spark SQL Upgrading Guide
## Upgrading From Spark SQL 2.4 to 3.0
- In PySpark, when creating a `SparkSession` with
`SparkSession.builder.getOrCreate()`, if there is an existing `SparkContext`,
the builder was trying to update the `SparkConf` of the existing `SparkContext`
with configurations specified to the builder, but the `SparkContext` is shared
by all `SparkSession`s, so we should not update them. Since 3.0, the builder
comes to not update the configurations. This is the same behavior as Java/Scala
API in 2.3 and above. If you want to update them, you need to update them prior
to creating a `SparkSession`.
+ - In Avro data source, the function `from_avro` supports following parse
modes:
--- End diff --
nit: let's add a space to make it more readable (I added each space between
each item).
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