Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/7644#discussion_r35829659 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala --- @@ -254,19 +255,231 @@ case class DateFormatClass(left: Expression, right: Expression) extends BinaryEx override protected def nullSafeEval(timestamp: Any, format: Any): Any = { val sdf = new SimpleDateFormat(format.toString) - UTF8String.fromString(sdf.format(new Date(timestamp.asInstanceOf[Long] / 1000))) + UTF8String.fromString(sdf.format(new java.util.Date(timestamp.asInstanceOf[Long] / 1000))) } override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): String = { val sdf = classOf[SimpleDateFormat].getName defineCodeGen(ctx, ev, (timestamp, format) => { s"""UTF8String.fromString((new $sdf($format.toString())) - .format(new java.sql.Date($timestamp / 1000)))""" + .format(new java.util.Date($timestamp / 1000)))""" }) } } /** + * Converts time string with given pattern + * (see [http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html]) + * to Unix time stamp (in seconds), returns null if fail. + * Note that hive Language Manual says it returns 0 if fail, but in fact it returns null. + * If the second parameter is missing, use "yyyy-MM-dd HH:mm:ss". + * If no parameters provided, the first parameter will be current_timestamp. + * If the first parameter is a Date or Timestamp instead of String, we will ignore the + * second parameter. + */ +case class UnixTimestamp(timeExp: Expression, format: Expression) + extends BinaryExpression with ExpectsInputTypes { + + override def left: Expression = timeExp + override def right: Expression = format + + def this(time: Expression) = { + this(time, Literal("yyyy-MM-dd HH:mm:ss")) + } + + def this() = { + this(CurrentTimestamp()) + } + + override def inputTypes: Seq[AbstractDataType] = + Seq(TypeCollection(StringType, DateType, TimestampType), StringType) + + override def dataType: DataType = LongType + + lazy val constFormat: UTF8String = right.eval().asInstanceOf[UTF8String] + + override def eval(input: InternalRow): Any = { + val t = left.eval(input) + if (t == null) { + null + } else { + left.dataType match { + case DateType => + DateTimeUtils.daysToMillis(t.asInstanceOf[Int]) / 1000L + case TimestampType => + t.asInstanceOf[Long] / 1000000L + case StringType if right.foldable => + if (constFormat != null) { + Try(new SimpleDateFormat(constFormat.toString).parse( + t.asInstanceOf[UTF8String].toString).getTime / 1000L).getOrElse(null) + } else { + null + } + case StringType => + val f = format.eval(input) + if (f == null) { + null + } else { + val formatString = f.asInstanceOf[UTF8String].toString + Try(new SimpleDateFormat(formatString).parse( + t.asInstanceOf[UTF8String].toString).getTime / 1000L).getOrElse(null) + } + } + } + } + + override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): String = { + left.dataType match { + case StringType if right.foldable => + val sdf = classOf[SimpleDateFormat].getName + val fString = if (constFormat == null) null else constFormat.toString + val formatter = ctx.freshName("formatter") + if (fString == null) { + s""" + boolean ${ev.isNull} = true; + ${ctx.javaType(dataType)} ${ev.primitive} = ${ctx.defaultValue(dataType)}; + """ + } else { + val eval1 = left.gen(ctx) + s""" + ${eval1.code} + boolean ${ev.isNull} = ${eval1.isNull}; + ${ctx.javaType(dataType)} ${ev.primitive} = ${ctx.defaultValue(dataType)}; + if (!${ev.isNull}) { + try { + $sdf $formatter = new $sdf("$fString"); + ${ev.primitive} = + $formatter.parse(${eval1.primitive}.toString()).getTime() / 1000L; + } catch (java.lang.Throwable e) { + ${ev.isNull} = true; + } + } + """ + } + case StringType => + val sdf = classOf[SimpleDateFormat].getName + nullSafeCodeGen(ctx, ev, (string, format) => { + s""" + try { + ${ev.primitive} = + (new $sdf($format.toString())).parse($string.toString()).getTime() / 1000L; + } catch (java.lang.Throwable e) { + ${ev.isNull} = true; + } + """ + }) + case TimestampType => + val eval1 = left.gen(ctx) + s""" + ${eval1.code} + boolean ${ev.isNull} = ${eval1.isNull}; + ${ctx.javaType(dataType)} ${ev.primitive} = ${ctx.defaultValue(dataType)}; + if (!${ev.isNull}) { + ${ev.primitive} = ${eval1.primitive} / 1000000L; + } + """ + case DateType => + val dtu = DateTimeUtils.getClass.getName.stripSuffix("$") + val eval1 = left.gen(ctx) + s""" + ${eval1.code} + boolean ${ev.isNull} = ${eval1.isNull}; + ${ctx.javaType(dataType)} ${ev.primitive} = ${ctx.defaultValue(dataType)}; + if (!${ev.isNull}) { + ${ev.primitive} = $dtu.daysToMillis(${eval1.primitive}) / 1000L; + } + """ + } + } +} + +/** + * Converts the number of seconds from unix epoch (1970-01-01 00:00:00 UTC) to a string + * representing the timestamp of that moment in the current system time zone in the given + * format. If the format is missing, using format like "1970-01-01 00:00:00". + * Note that hive Language Manual says it returns 0 if fail, but in fact it returns null. + */ +case class FromUnixTime(sec: Expression, format: Expression) + extends BinaryExpression with ImplicitCastInputTypes { + + override def left: Expression = sec + override def right: Expression = format + + def this(unix: Expression) = { + this(unix, Literal("yyyy-MM-dd HH:mm:ss")) + } + + override def dataType: DataType = StringType + + override def inputTypes: Seq[AbstractDataType] = Seq(LongType, StringType) + + lazy val constFormat: UTF8String = right.eval().asInstanceOf[UTF8String] + + override def eval(input: InternalRow): Any = { + val time = left.eval(input) + if (time == null) { + null + } else { + if (format.foldable) { + if (constFormat == null) { + null + } else { + Try(UTF8String.fromString(new SimpleDateFormat(constFormat.toString).format( + new java.util.Date(time.asInstanceOf[Long] * 1000L)))).getOrElse(null) + } + } else { + val f = format.eval(input) + if (f == null) { + null + } else { + Try(UTF8String.fromString(new SimpleDateFormat( + f.asInstanceOf[UTF8String].toString).format(new java.util.Date( + time.asInstanceOf[Long] * 1000L)))).getOrElse(null) + } + } + } + } + + override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): String = { + val sdf = classOf[SimpleDateFormat].getName + if (format.foldable) { + if (constFormat == null) { + s""" + boolean ${ev.isNull} = true; + ${ctx.javaType(dataType)} ${ev.primitive} = ${ctx.defaultValue(dataType)}; + """ + } else { + val t = left.gen(ctx) + s""" + ${t.code} + boolean ${ev.isNull} = ${t.isNull}; + ${ctx.javaType(dataType)} ${ev.primitive} = ${ctx.defaultValue(dataType)}; + if (!${ev.isNull}) { + try { + ${ev.primitive} = UTF8String.fromString(new $sdf("${constFormat.toString}").format( + new java.sql.Timestamp(${t.primitive} * 1000L))); + } catch (java.lang.Throwable e) { + ${ev.isNull} = true; + } + } + """ + } + } else { + nullSafeCodeGen(ctx, ev, (seconds, f) => { + s""" + try { + ${ev.primitive} = UTF8String.fromString((new $sdf($f.toString())).format( + new java.sql.Timestamp($seconds * 1000L))); --- End diff -- java.util.Date?
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