Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15295#discussion_r81257401
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -877,3 +861,36 @@ private[sql] class SQLConf extends Serializable with
CatalystConf with Logging {
}
}
+/**
+ * Global SQL configuration is a cross-session, immutable Spark
configuration. External users can
+ * see the global sql configs via `SparkSession.conf`, but can NOT
set/unset them.
+ */
+object GlobalSQLConf {
+ val globalConfKeys = java.util.Collections.synchronizedSet(new
java.util.HashSet[String]())
+
+ private def buildConf(key: String): ConfigBuilder = {
+ ConfigBuilder(key).onCreate { entry =>
+ globalConfKeys.add(entry.key)
+ SQLConf.register(entry)
+ }
+ }
+
+ val CATALOG_IMPLEMENTATION = buildConf("spark.sql.catalogImplementation")
+ .internal()
+ .stringConf
+ .checkValues(Set("hive", "in-memory"))
+ .createWithDefault("in-memory")
+
+ // This is used to control the when we will split a schema's JSON string
to multiple pieces
--- End diff --
Nit: remove `the`
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