Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6981#discussion_r34337804
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -54,3 +60,341 @@ case class CurrentTimestamp() extends LeafExpression {
System.currentTimeMillis() * 1000L
}
}
+
+/**
+ * Abstract class for create time format expressions.
+ */
+abstract class TimeFormatExpression extends UnaryExpression with
ExpectsInputTypes {
+ self: Product =>
+
+ protected val factorToMilli: Int
+
+ protected val cntPerInterval: Int
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(TimestampType)
+
+ override def dataType: DataType = IntegerType
+
+ override protected def nullSafeEval(timestamp: Any): Any = {
+ val time = timestamp.asInstanceOf[Long] / 1000
+ val longTime: Long = time + TimeZone.getDefault.getOffset(time)
+ ((longTime / factorToMilli) % cntPerInterval).toInt
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ val tz = classOf[TimeZone].getName
+ defineCodeGen(ctx, ev, (c) =>
+ s"""(${ctx.javaType(dataType)})
+ ((($c / 1000) + $tz.getDefault().getOffset($c / 1000))
+ / $factorToMilli % $cntPerInterval)"""
+ )
+ }
+}
+
+case class Hour(child: Expression) extends TimeFormatExpression {
+
+ override protected val factorToMilli: Int = 1000 * 3600
+
+ override protected val cntPerInterval: Int = 24
+}
+
+case class Minute(child: Expression) extends TimeFormatExpression {
+
+ override protected val factorToMilli: Int = 1000 * 60
+
+ override protected val cntPerInterval: Int = 60
+}
+
+case class Second(child: Expression) extends UnaryExpression with
ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(TimestampType)
+
+ override def dataType: DataType = IntegerType
+
+ override protected def nullSafeEval(time: Any): Any = {
+ time.asInstanceOf[Long] / 1000L / 1000L % 60L
+ }
+
+ override protected def genCode(ctx: CodeGenContext, ev:
GeneratedExpressionCode): String = {
+ nullSafeCodeGen(ctx, ev, (time) => {
+ s"""${ev.primitive} = (${ctx.javaType(IntegerType)}) ($time / 1000L
/ 1000L % 60L);"""
+ })
+ }
+}
+
+private[sql] object DateFormatExpression {
+
+ def isLeapYear(year: Int): Boolean = {
+ (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)
+ }
+
+ val yearBoundaries = new Array[Int](2330 - 1599)
+
+ var i = 0
+ yearBoundaries(i) = -135140
+ (1601 to 2330) foreach { year =>
+ i = i + 1
+ if (isLeapYear(year - 1)) {
+ yearBoundaries(i) = yearBoundaries(i - 1) + 366
+ } else {
+ yearBoundaries(i) = yearBoundaries(i - 1) + 365
+ }
+ }
+}
+
+abstract class DateFormatExpression extends UnaryExpression with
ExpectsInputTypes {
+ self: Product =>
+
+ override def dataType: DataType = IntegerType
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType)
+
+ protected def calculateYearAndDayInYear(daysIn: Int): (Int, Int) = {
+ var index: Int = 370 + (daysIn / 365.24).toInt - 1
+ while (DateFormatExpression.yearBoundaries(index) < daysIn + 1) {
+ index += 1
+ }
+ (index - 1 + 1600, daysIn - DateFormatExpression.yearBoundaries(index
- 1) + 1)
+ }
+
+ protected def codeGen(ctx: CodeGenContext, ev: GeneratedExpressionCode,
input: String,
+ f: (String, String) => String): String = {
+ val yb = ctx.freshName("yb")
+ val i = ctx.freshName("counter")
+ val x = ctx.freshName("counter")
+ val index = ctx.freshName("index")
+ val year = ctx.freshName("year")
+ val dayInYear = ctx.freshName("dayInYear")
+
+ s"""
+ int[] $yb = new int[2330 - 1599];
+ $yb[0] = -135140;
+ int $x = 1;
+ for(int $i = 1601; $i <= 2330; $i++, $x++) {
+ $yb[$x] = (($i - 1) % 4 == 0 && (($i - 1) % 100 != 0 || ($i - 1)
% 400 == 0)) ?
+ $yb[$x - 1] + 366 : $yb[$x - 1] + 365;
+ }
+ int $index = 370 + ((int) ($input / 365.24)) - 1;
+ while ($yb[$index] < $input + 1) {
+ $index++;
+ }
+ int $year = $index - 1 + 1600;
+ int $dayInYear = $input - $yb[$index - 1] + 1;
+ ${f(year, dayInYear)}
--- End diff --
@davies is there a way to provide `yb` somehow as static field?
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