Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8606#discussion_r38992129
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -56,6 +57,12 @@ object DateTimeUtils {
@transient lazy val defaultTimeZone = TimeZone.getDefault
+ // Constants defining the allowed ranges for timestampts that fit in
parquet files. Mostly
+ // used by tests to avoid duplication.
+ private[spark] final val MIN_TIMESTAMP: Long =
+ -(DateTimeUtils.JULIAN_DAY_OF_EPOCH * DateTimeUtils.SECONDS_PER_DAY *
1000)
--- End diff --
I gave it a try and I got
```
scala> new java.sql.Timestamp(-4708372992000L)
res3: java.sql.Timestamp = 1820-10-18 14:36:48.0
scala> java.sql.Timestamp.valueOf("0317-02-14 06:13:20.0")
res7: java.sql.Timestamp = 0317-02-14 06:13:20.0
scala> res5.getTime
res8: Long = -52159715200000
scala> new java.sql.Timestamp(-72135740800000L)
res1: java.sql.Timestamp = 0317-02-14 06:13:20.0
```
So, is it the right lower bound?
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