Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18820#discussion_r132104328
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala ---
@@ -261,5 +261,37 @@ class DataFrameNaFunctionsSuite extends QueryTest with
SharedSQLContext {
assert(out1(3).get(2).asInstanceOf[Double].isNaN)
assert(out1(4) === Row("Amy", null, null))
assert(out1(5) === Row(null, null, null))
+
+ // Replace String with String and null
+ val out2 = input.na.replace("name", Map(
+ "Bob" -> "Bravo",
+ "Alice" -> null
+ )).collect()
+
+ assert(out2(0) === Row("Bravo", 16, 176.5))
+ assert(out2(1) === Row(null, null, 164.3))
+ assert(out2(2) === Row("David", 60, null))
+ assert(out2(3).get(2).asInstanceOf[Double].isNaN)
+ assert(out2(4) === Row("Amy", null, null))
+ assert(out2(5) === Row(null, null, null))
+
+ // Replace Double with null
--- End diff --
Also add a test case for boolean
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