jamisonbennett commented on a change in pull request #23398: [SPARK-26493][SQL]
Allow multiple spark.sql.extensions
URL: https://github.com/apache/spark/pull/23398#discussion_r245484843
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/StaticSQLConf.scala
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@@ -99,9 +99,15 @@ object StaticSQLConf {
.createWithDefault(false)
val SPARK_SESSION_EXTENSIONS = buildStaticConf("spark.sql.extensions")
- .doc("Name of the class used to configure Spark Session extensions. The
class should " +
- "implement Function1[SparkSessionExtension, Unit], and must have a
no-args constructor.")
+ .doc("A comma-separated list of classes that implement " +
+ "Function1[SparkSessionExtension, Unit] used to configure Spark Session
extensions. The " +
+ "classes must have a no-args constructor. If multiple extensions are
specified, they are " +
+ "applied in the specified order. For the case of rules and planner
strategies, they are " +
+ "applied in the specified order. For the case of parsers, the last
parser is used and each " +
+ "parser can delegate to its predecessor. For the case of function name
conflicts, the last " +
Review comment:
I added an example to the documentation of `SparkSessionExtensions`.
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