Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18852#discussion_r131527017
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/internal/SQLConfSuite.scala ---
@@ -270,4 +270,10 @@ class SQLConfSuite extends QueryTest with
SharedSQLContext {
val e2 =
intercept[AnalysisException](spark.conf.unset(SCHEMA_STRING_LENGTH_THRESHOLD.key))
assert(e2.message.contains("Cannot modify the value of a static
config"))
}
+
+ test("SPARK-21588 SQLContext.getConf(key, null) should return null") {
+ assert(null ==
spark.conf.get("spark.sql.thriftServer.incrementalCollect", null))
+ assert("<undefined>" == spark.conf.get(
+ "spark.sql.thriftServer.incrementalCollect", "<undefined>"))
--- End diff --
The test cases need to be improved.
```Scala
withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "1") {
assert("1" == spark.conf.get(SQLConf.SHUFFLE_PARTITIONS.key, null))
assert("1" == spark.conf.get(SQLConf.SHUFFLE_PARTITIONS.key,
"<undefined>"))
}
assert(spark.conf.getOption("spark.sql.nonexistent").isEmpty)
assert(null == spark.conf.get("spark.sql.nonexistent", null))
assert("<undefined>" == spark.conf.get("spark.sql.nonexistent",
"<undefined>"))
```
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