Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/12119#discussion_r58281770
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -722,6 +722,16 @@ class SQLConf extends Serializable with CatalystConf
with Logging {
}
/**
+ * Return the value of Spark SQL configuration property for the given
key. If the key is not set
+ * yet, return `defaultValue` in [[SQLConfEntry]] when available. If
there is no default and
+ * the option is not set, returns `null`.
--- End diff --
nit: returns `None`.
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