uros-db commented on code in PR #46561:
URL: https://github.com/apache/spark/pull/46561#discussion_r1599701817


##########
sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
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@@ -959,6 +959,37 @@ class CollationStringExpressionsSuite
     assert(collationMismatch.getErrorClass === 
"DATATYPE_MISMATCH.UNEXPECTED_INPUT_TYPE")
   }
 
+  test("DateFormat string expression with collation") {
+    case class DateFormatTestCase[R](d: String, f: String, c: String, r: R)
+    val testCases = Seq(
+      DateFormatTestCase("2021-01-01", "yyyy-MM-dd", "UTF8_BINARY", 
"2021-01-01"),
+      DateFormatTestCase("2021-01-01", "yyyy-dd", "UTF8_BINARY_LCASE", 
"2021-01"),
+      DateFormatTestCase("2021-01-01", "yyyy-MM-dd", "UNICODE", "2021-01-01"),
+      DateFormatTestCase("2021-01-01", "yyyy", "UNICODE_CI", "2021")
+    )
+
+    testCases.foreach(t => {
+      val query = s"SELECT date_format(collate('${t.d}', '${t.c}'), '${t.f}')"
+      // Result & data type
+      checkAnswer(sql(query), Row(t.r))
+      
assert(sql(query).schema.fields.head.dataType.sameType(SQLConf.get.defaultStringType))

Review Comment:
   nice job! however, I would suggest that you include the fix for that (1 
line?) here, since the changes in this PR are rather small to begin with



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