HyukjinKwon commented on a change in pull request #23597: [SPARK-26653][SQL] 
Use Proleptic Gregorian calendar in parsing JDBC lower/upper bounds
URL: https://github.com/apache/spark/pull/23597#discussion_r249802282
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRelation.scala
 ##########
 @@ -174,10 +174,21 @@ private[sql] object JDBCRelation extends Logging {
     (dialect.quoteIdentifier(column.name), column.dataType)
   }
 
-  private def toInternalBoundValue(value: String, columnType: DataType): Long 
= columnType match {
-    case _: NumericType => value.toLong
-    case DateType => DateTimeUtils.fromJavaDate(Date.valueOf(value)).toLong
-    case TimestampType => 
DateTimeUtils.fromJavaTimestamp(Timestamp.valueOf(value))
+  private def toInternalBoundValue(
+      value: String,
+      columnType: DataType,
+      timeZoneId: String): Long = {
+    def parse[T](f: UTF8String => Option[T]): T = {
+      f(UTF8String.fromString(value)).getOrElse {
 
 Review comment:
   Is this pattern being repeated? We could add a util somewhere and reuse it. 
We can do it in another place assuming you're still working about this here and 
there.

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