Use ConfigEntry.findEntry().

Author: ueshin

sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala

@@ -45,7 +45,7 @@ import org.apache.spark.util.Utils
 
 object SQLConf {
 
-  private val sqlConfEntries = java.util.Collections.synchronizedMap(
+  private[sql] val sqlConfEntries = java.util.Collections.synchronizedMap(
     new java.util.HashMap[String, ConfigEntry[_]]())
 
   val staticConfKeys: java.util.Set[String] =

sql/core/src/main/scala/org/apache/spark/sql/RuntimeConfig.scala

@@ -17,7 +17,6 @@
 
 package org.apache.spark.sql
 
-import org.apache.spark.SparkConf
 import org.apache.spark.annotation.InterfaceStability
 import org.apache.spark.internal.config.{ConfigEntry, OptionalConfigEntry}
 import org.apache.spark.sql.internal.SQLConf
@@ -155,7 +154,8 @@ class RuntimeConfig private[sql](sqlConf: SQLConf = new SQLConf) {
     if (SQLConf.staticConfKeys.contains(key)) {
       throw new AnalysisException(s"Cannot modify the value of a static config: $key")
     }
-    if (sqlConf.setCommandRejectsSparkConfs && SparkConf.sparkConfEntries.containsKey(key)) {
+    if (sqlConf.setCommandRejectsSparkConfs &&
+        ConfigEntry.findEntry(key) != null && !SQLConf.sqlConfEntries.containsKey(key)) {
       throw new AnalysisException(s"Cannot modify the value of a spark config: $key")
     }
   }