beliefer commented on code in PR #44110:
URL: https://github.com/apache/spark/pull/44110#discussion_r1413737755


##########
sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala:
##########
@@ -305,21 +305,32 @@ trait SparkDateTimeUtils {
       (segment == 0 && digits >= 4 && digits <= maxDigitsYear) ||
         (segment != 0 && digits > 0 && digits <= 2)
     }
-    if (s == null || s.trimAll().numBytes() == 0) {
+    if (s == null) {
       return None
     }
+
     val segments: Array[Int] = Array[Int](1, 1, 1)
     var sign = 1
     var i = 0
     var currentSegmentValue = 0
     var currentSegmentDigits = 0
-    val bytes = s.trimAll().getBytes

Review Comment:
   We can reuse the `trimLeft` here.



##########
sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala:
##########
@@ -305,21 +305,32 @@ trait SparkDateTimeUtils {
       (segment == 0 && digits >= 4 && digits <= maxDigitsYear) ||
         (segment != 0 && digits > 0 && digits <= 2)
     }
-    if (s == null || s.trimAll().numBytes() == 0) {
+    if (s == null) {
       return None
     }
+
     val segments: Array[Int] = Array[Int](1, 1, 1)
     var sign = 1
     var i = 0
     var currentSegmentValue = 0
     var currentSegmentDigits = 0
-    val bytes = s.trimAll().getBytes
+    val bytes = s.getBytes
     var j = 0
+
+    while (j < bytes.length && UTF8String.isWhitespaceOrISOControl(bytes(j))) {
+      j += 1;
+    }

Review Comment:
   After using `trimLeft`, we can delete the three lines.



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