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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