cloud-fan commented on code in PR #51547:
URL: https://github.com/apache/spark/pull/51547#discussion_r2239853479
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/timeExpressions.scala:
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@@ -630,3 +630,56 @@ case class SubtractTimes(left: Expression, right:
Expression)
newLeft: Expression, newRight: Expression): SubtractTimes =
copy(left = newLeft, right = newRight)
}
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = """
+ _FUNC_(unit, expr) - Returns time `expr` truncated to the unit specified
by the unit `unit`.
+ """,
+ arguments = """
+ Arguments:
+ * unit - the unit representing the unit to be truncated to
+ - "HOUR" - zero out the minutes and seconds with fraction part
+ - "MINUTE" - zero out the seconds with fraction part
+ - "SECOND" - zero out the fraction part of seconds
+ - "MILLISECOND" - zero out the microseconds
+ - "MICROSECOND" - zero out the nanoseconds
+ * expr - a TIME with a valid time format
Review Comment:
```suggestion
* expr - a TIME type expression
```
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