HyukjinKwon commented on a change in pull request #33877:
URL: https://github.com/apache/spark/pull/33877#discussion_r703373865
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
##########
@@ -708,6 +708,19 @@ case class UnixSeconds(child: Expression) extends
TimestampToLongBase {
copy(child = newChild)
}
+// Internal expression used to get the raw UTC timestamp in pandas API on
Spark.
Review comment:
The timstamp will be considered as a local timesone and will be
normalized to UTC internally:
https://github.com/apache/spark/blob/f2492772baf1d00d802e704f84c22a9c410929e9/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala#L510
e.g.)
```scala
scala> sql("SELECT CAST(CAST(TIMESTAMP_NTZ '1970-01-01 00:00:00' AS
TIMESTAMP) AS LONG)").show()
+----------------------------------------------------------------------+
|CAST(CAST(TIMESTAMP_NTZ '1970-01-01 00:00:00' AS TIMESTAMP) AS BIGINT)|
+----------------------------------------------------------------------+
| -32400|
+----------------------------------------------------------------------+
```
This has to be in UTC to mimic pandas' behaviour.
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