Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7644#discussion_r35842378
--- 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(
--- End diff --
There are many expressions rely on `SimpleDateFormat`, including some
merged expressions such as `DateFormatClass`. Let's do this later, maybe we can
extract a common trait for this kind of expressions.
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