uros-db commented on code in PR #46041:
URL: https://github.com/apache/spark/pull/46041#discussion_r1567208600


##########
sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
##########
@@ -212,6 +212,48 @@ class CollationStringExpressionsSuite
     })
   }
 
+  test("Support StringRPad string expressions with collation") {
+    // Supported collations
+    case class StringRPadTestCase[R](s: String, len: Int, pad: String, c: 
String, result: R)
+    val testCases = Seq(
+      StringRPadTestCase("", 5, " ", "UTF8_BINARY", "     "),
+      StringRPadTestCase("abc", 5, " ", "UNICODE", "abc  "),
+      StringRPadTestCase("Hello", 7, "Wörld", "UTF8_BINARY_LCASE", "HelloWö"), 
// scalastyle:ignore
+      StringRPadTestCase("1234567890", 5, "aaaAAa", "UNICODE_CI", "12345"),
+      StringRPadTestCase("aaAA", 2, " ", "UTF8_BINARY", "aa"),
+      StringRPadTestCase("ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ℀℃", 2, "1", "UNICODE", "ÀÃ"), 
// scalastyle:ignore
+      StringRPadTestCase("ĂȦÄäåäá", 20, "ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ", 
"UTF8_BINARY_LCASE", "ĂȦÄäåäáÀÃÂĀĂȦÄäåäáâã"), // scalastyle:ignore
+      StringRPadTestCase("aȦÄä", 8, "a1", "UNICODE_CI", "aȦÄäa1a1") // 
scalastyle:ignore
+    )
+    testCases.foreach(t => {
+      val query = s"SELECT rpad(collate('${t.s}', '${t.c}'), ${t.len}, 
'${t.pad}')"
+      // Result & data type
+      checkAnswer(sql(query), Row(t.result))
+      assert(sql(query).schema.fields.head.dataType.sameType(StringType(t.c)))
+      })
+  }
+
+    test("Support StringLPad string expressions with collation") {
+      // Supported collations
+      case class StringLPadTestCase[R](s: String, len: Int, pad: String, c: 
String, result: R)
+      val testCases = Seq(
+        StringLPadTestCase("", 5, " ", "UTF8_BINARY", "     "),
+        StringLPadTestCase("abc", 5, " ", "UNICODE", "  abc"),
+        StringLPadTestCase("Hello", 7, "Wörld", "UTF8_BINARY_LCASE", 
"WöHello"), // scalastyle:ignore
+        StringLPadTestCase("1234567890", 5, "aaaAAa", "UNICODE_CI", "12345"),
+        StringLPadTestCase("aaAA", 2, " ", "UTF8_BINARY", "aa"),
+        StringLPadTestCase("ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ℀℃", 2, "1", "UNICODE", 
"ÀÃ"), // scalastyle:ignore
+        StringLPadTestCase("ĂȦÄäåäá", 20, "ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ", 
"UTF8_BINARY_LCASE", "ÀÃÂĀĂȦÄäåäáâãĂȦÄäåäá"), // scalastyle:ignore
+        StringLPadTestCase("aȦÄä", 8, "a1", "UNICODE_CI", "a1a1aȦÄä") // 
scalastyle:ignore
+      )
+      testCases.foreach(t => {
+        val query = s"SELECT lpad(collate('${t.s}', '${t.c}'), ${t.len}, 
'${t.pad}')"

Review Comment:
   what about:
   `SELECT lpad(collate('${t.s}', '${t.c}'), ${t.len}, collate('${t.pad}', 
'${t.c}'))`
   and
   `SELECT lpad('${t.s}', ${t.len}, collate('${t.pad}', '${t.c}'))`



##########
sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
##########
@@ -212,6 +212,48 @@ class CollationStringExpressionsSuite
     })
   }
 
+  test("Support StringRPad string expressions with collation") {
+    // Supported collations
+    case class StringRPadTestCase[R](s: String, len: Int, pad: String, c: 
String, result: R)
+    val testCases = Seq(
+      StringRPadTestCase("", 5, " ", "UTF8_BINARY", "     "),
+      StringRPadTestCase("abc", 5, " ", "UNICODE", "abc  "),
+      StringRPadTestCase("Hello", 7, "Wörld", "UTF8_BINARY_LCASE", "HelloWö"), 
// scalastyle:ignore
+      StringRPadTestCase("1234567890", 5, "aaaAAa", "UNICODE_CI", "12345"),
+      StringRPadTestCase("aaAA", 2, " ", "UTF8_BINARY", "aa"),
+      StringRPadTestCase("ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ℀℃", 2, "1", "UNICODE", "ÀÃ"), 
// scalastyle:ignore
+      StringRPadTestCase("ĂȦÄäåäá", 20, "ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ", 
"UTF8_BINARY_LCASE", "ĂȦÄäåäáÀÃÂĀĂȦÄäåäáâã"), // scalastyle:ignore
+      StringRPadTestCase("aȦÄä", 8, "a1", "UNICODE_CI", "aȦÄäa1a1") // 
scalastyle:ignore
+    )
+    testCases.foreach(t => {
+      val query = s"SELECT rpad(collate('${t.s}', '${t.c}'), ${t.len}, 
'${t.pad}')"
+      // Result & data type
+      checkAnswer(sql(query), Row(t.result))
+      assert(sql(query).schema.fields.head.dataType.sameType(StringType(t.c)))
+      })
+  }
+
+    test("Support StringLPad string expressions with collation") {
+      // Supported collations
+      case class StringLPadTestCase[R](s: String, len: Int, pad: String, c: 
String, result: R)
+      val testCases = Seq(
+        StringLPadTestCase("", 5, " ", "UTF8_BINARY", "     "),
+        StringLPadTestCase("abc", 5, " ", "UNICODE", "  abc"),
+        StringLPadTestCase("Hello", 7, "Wörld", "UTF8_BINARY_LCASE", 
"WöHello"), // scalastyle:ignore
+        StringLPadTestCase("1234567890", 5, "aaaAAa", "UNICODE_CI", "12345"),
+        StringLPadTestCase("aaAA", 2, " ", "UTF8_BINARY", "aa"),
+        StringLPadTestCase("ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ℀℃", 2, "1", "UNICODE", 
"ÀÃ"), // scalastyle:ignore
+        StringLPadTestCase("ĂȦÄäåäá", 20, "ÀÃÂĀĂȦÄäåäáâãȻȻȻȻȻǢǼÆ", 
"UTF8_BINARY_LCASE", "ÀÃÂĀĂȦÄäåäáâãĂȦÄäåäá"), // scalastyle:ignore
+        StringLPadTestCase("aȦÄä", 8, "a1", "UNICODE_CI", "a1a1aȦÄä") // 
scalastyle:ignore
+      )
+      testCases.foreach(t => {
+        val query = s"SELECT lpad(collate('${t.s}', '${t.c}'), ${t.len}, 
'${t.pad}')"
+        // Result & data type
+        checkAnswer(sql(query), Row(t.result))
+        
assert(sql(query).schema.fields.head.dataType.sameType(StringType(t.c)))
+      })

Review Comment:
   what about collation mismatch?



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