Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7353#discussion_r34758993
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -180,4 +182,202 @@ 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 a corresponding
[[Long]] value.
+ * The return type is [[Option]] in order to distinguish between 0L and
null. The following
+ * formats are allowed:
+ *
+ * `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][us][us][us]`
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]Z`
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]-[h]h:[m]m`
+ * `yyyy-[m]m-[d]d [h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]+[h]h:[m]m`
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]`
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]Z`
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]-[h]h:[m]m`
+ * `yyyy-[m]m-[d]dT[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]+[h]h:[m]m`
+ * `[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]`
+ * `[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]Z`
+ * `[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]-[h]h:[m]m`
+ * `[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]+[h]h:[m]m`
+ * `T[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]`
+ * `T[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]Z`
+ * `T[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]-[h]h:[m]m`
+ * `T[h]h:[m]m:[s]s.[ms][ms][ms][us][us][us]+[h]h:[m]m`
+ */
+ def stringToTimestamp(s: UTF8String): Option[Long] = {
+ if (s == null) {
+ return None
+ }
+ 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
+ var justTime = false
+ while (j < bytes.length) {
+ val b = bytes(j)
+ val parsedValue = b - '0'.toByte
+ if (parsedValue < 0 || parsedValue > 9) {
+ if (j == 0 && b == 'T') {
+ justTime = true
+ i += 3
+ } else if (i < 2) {
+ if (b == '-') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else if (i == 0 && b == ':') {
+ justTime = true
+ segments(3) = currentSegmentValue
+ currentSegmentValue = 0
+ i = 4
+ } else {
+ return None
+ }
+ } else if (i == 2) {
+ if (b == ' ' || b == 'T') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else {
+ return None
+ }
+ } else if (i == 3 || i == 4) {
+ if (b == ':') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else {
+ return None
+ }
+ } else if (i == 5 || i == 6) {
+ if (b == 'Z') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ timeZone = Some(43)
+ } else if (b == '-' || b == '+') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ timeZone = Some(b)
+ } else if (b == '.' && i == 5) {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else {
+ return None
+ }
+ if (i == 6 && b != '.') {
+ i += 1
+ }
+ } else {
+ if (b == ':' || b == ' ') {
+ segments(i) = currentSegmentValue
+ currentSegmentValue = 0
+ i += 1
+ } else {
+ return None
+ }
+ }
+ } else {
+ if (i == 6) {
+ digitsMilli += 1
+ }
+ currentSegmentValue = currentSegmentValue * 10 + parsedValue
+ }
+ j += 1
+ }
+
+ segments(i) = currentSegmentValue
+
+ while (digitsMilli < 6) {
+ segments(6) *= 10
+ digitsMilli += 1
+ }
+
+ if (!justTime && (segments(0) < 1000 || segments(0) > 9999 ||
segments(1) < 1 ||
+ segments(1) > 12 || segments(2) < 1 || segments(2) > 31)) {
+ return None
+ }
+
+ if (segments(3) < 0 || segments(3) > 23 || segments(4) < 0 ||
segments(4) > 59 ||
+ segments(5) < 0 || segments(5) > 59 || segments(6) < 0 ||
segments(6) > 999999 ||
+ segments(7) < 0 || segments(7) > 23 || segments(8) < 0 ||
segments(8) > 59) {
+ return None
+ }
+
+ val c = if (timeZone.isEmpty) {
+ Calendar.getInstance()
+ } else {
+ Calendar.getInstance(
+
TimeZone.getTimeZone(f"GMT${timeZone.get.toChar}${segments(7)}%02d:${segments(8)}%02d"))
+ }
+
+ if (justTime) {
+ c.set(Calendar.HOUR, segments(3))
+ c.set(Calendar.MINUTE, segments(4))
+ c.set(Calendar.SECOND, segments(5))
+ } else {
+ c.set(segments(0), segments(1) - 1, segments(2), segments(3),
segments(4), segments(5))
+ }
+
+ c.set(Calendar.MILLISECOND, segments(6) / 1000)
+ Some(c.getTimeInMillis * 1000 + segments(6) % 1000)
--- End diff --
These two lines could be:
```
Some(c.getTimeInMillis * 1000 + segments(6))
```
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