stevomitric commented on code in PR #58855:
URL: https://github.com/apache/spark/pull/58855#discussion_r4035439221
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala:
##########
@@ -4981,8 +4981,13 @@ case class ConvertTimezone(
- "SECOND"
- "MILLISECOND"
- "MICROSECOND"
+ - "NANOSECOND" - only for nanosecond-precision timestamp inputs
(TIMESTAMP_NTZ(p) /
+ TIMESTAMP_LTZ(p), p in [7, 9]); the result is floored to the
input's precision, so a
+ quantity finer than the type's step (10^(9-p) ns) is truncated to
it
* quantity - this is the number of units of time that you want to add.
- * timestamp - this is a timestamp (w/ or w/o timezone) to which you want
to add.
+ * timestamp - this is a timestamp (w/ or w/o timezone) to which you want
to add. A
+ nanosecond-precision timestamp keeps its sub-microsecond fraction;
units of MICROSECOND or
+ coarser leave the fraction unchanged.
""",
Review Comment:
thanks for noticing, updated.
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