cloud-fan commented on a change in pull request #26507: [WIP][SQL][2.4] Parse 
timestamps in microsecond precision in JSON datasource
URL: https://github.com/apache/spark/pull/26507#discussion_r346289967
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
 ##########
 @@ -1164,4 +1167,27 @@ object DateTimeUtils {
     threadLocalTimestampFormat.remove()
     threadLocalDateFormat.remove()
   }
+
+  class MicrosCalendar(tz: TimeZone) extends GregorianCalendar(tz, Locale.US) {
+    def getMicros(digitsInFraction: Int): SQLTimestamp = {
+      val d = fields(Calendar.MILLISECOND) * MICROS_PER_SECOND
+      d / Decimal.POW_10(digitsInFraction)
+    }
+  }
+
+  class DateTimeParser(format: FastDateFormat, digitsInFraction: Int, cal: 
MicrosCalendar) {
+    def parse(s: String): SQLTimestamp = {
+      cal.clear()
+      if (!format.parse(s, new ParsePosition(0), cal)) {
+        throw new IllegalArgumentException(s)
 
 Review comment:
   nit: we should say `'s' is an invalid timestamp`

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