Github user MaxGekk commented on a diff in the pull request: https://github.com/apache/spark/pull/21730#discussion_r201817629 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/RuntimeConfigSuite.scala --- @@ -54,4 +54,15 @@ class RuntimeConfigSuite extends SparkFunSuite { conf.get("k1") } } + + test("SPARK-24761: is a config parameter modifiable") { + val conf = newConf() + + // SQL configs + assert(!conf.isModifiable("spark.sql.sources.schemaStringLengthThreshold")) --- End diff -- Added a couple tests
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