Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7353#discussion_r34523735
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -180,4 +182,169 @@ object DateTimeUtils {
val nanos = (us % MICROS_PER_SECOND) * 1000L
(day.toInt, secondsInDay * NANOS_PER_SECOND + nanos)
}
+
+ /**
+ * Parses a given UTF8 date string to the corresponding [[Timestamp]]
object. The format of the
+ * date has to be one of the following: `yyyy`, `yyyy-[m]m`,
`yyyy-[m]m-[d]d`, `yyyy-[m]m-[d]d `,
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][ms]`,
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][ms]Z`,
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][ms]-[h]h:[m]m`,
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][ms]+[h]h:[m]m`,
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][ms]`,
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][ms]Z`,
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][ms]-[h]h:[m]m`,
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][ms]+[h]h:[m]m`,
+ */
+ def stringToTimestamp(s: UTF8String): Timestamp = {
+ if (s == null) {
+ return null
+ }
+ var timeZone: Option[Byte] = None
+ val segments: Array[Int] = Array[Int](1, 1, 1, 0, 0, 0, 0, 0, 0)
+ var i = 0
+ var currentSegmentValue = 0
+ val bytes = s.getBytes
+ var j = 0
+ var digitsMilli = 0
+ while (j < bytes.length) {
+ val b = bytes(j)
+ val parsedValue = b - 48
+ if (parsedValue < 0 || parsedValue > 9) {
+ if (i < 2) {
+ if (b == '-') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else {
+ return null
+ }
+ } else if (i == 2) {
+ if (b == ' ' || b == 'T') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else {
+ return null
+ }
+ } else if (i < 5) {
+ if (b == ':') {
--- End diff --
This is equals to `i == 3 || i == 4`, because of the `if` and `elseif`
before. I am going to adjust the checks that
they are more readable.
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