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[SPARK-26978][SQL][FOLLOWUP] Initialize date-time constants by foldable expressions #25116

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[SPARK-26978][SQL][FOLLOWUP] Initialize date-time constants by foldable expressions #25116

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24 changes: 13 additions & 11 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -45,17 +45,19 @@ object DateTimeUtils {
// it's 2440587.5, rounding up to compatible with Hive
final val JULIAN_DAY_OF_EPOCH = 2440588

final val NANOS_PER_MICROS = MICROSECONDS.toNanos(1)
final val NANOS_PER_MILLIS = MILLISECONDS.toNanos(1)
final val NANOS_PER_SECOND = SECONDS.toNanos(1)
final val MICROS_PER_MILLIS = MILLISECONDS.toMicros(1)
final val MICROS_PER_SECOND = SECONDS.toMicros(1)
final val MICROS_PER_DAY = DAYS.toMicros(1)
final val MILLIS_PER_SECOND = SECONDS.toMillis(1)
final val MILLIS_PER_MINUTE = MINUTES.toMillis(1)
final val MILLIS_PER_HOUR = HOURS.toMillis(1)
final val MILLIS_PER_DAY = DAYS.toMillis(1)
final val SECONDS_PER_DAY = DAYS.toSeconds(1)
// Pre-calculated values can provide an opportunity of additional optimizations
// to the compiler like constants propagation and folding.
final val NANOS_PER_MICROS: Long = 1000
final val MICROS_PER_MILLIS: Long = 1000
final val MILLIS_PER_SECOND: Long = 1000
final val SECONDS_PER_DAY: Long = 24 * 60 * 60
final val MICROS_PER_SECOND: Long = MILLIS_PER_SECOND * MICROS_PER_MILLIS
final val NANOS_PER_MILLIS: Long = NANOS_PER_MICROS * MICROS_PER_MILLIS
final val NANOS_PER_SECOND: Long = NANOS_PER_MICROS * MICROS_PER_SECOND
final val MICROS_PER_DAY: Long = SECONDS_PER_DAY * MICROS_PER_SECOND
final val MILLIS_PER_MINUTE: Long = 60 * MILLIS_PER_SECOND
final val MILLIS_PER_HOUR: Long = 60 * MILLIS_PER_MINUTE
final val MILLIS_PER_DAY: Long = SECONDS_PER_DAY * MILLIS_PER_SECOND

// number of days between 1.1.1970 and 1.1.2001
final val to2001 = -11323
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