yaooqinn commented on a change in pull request #28313:
URL: https://github.com/apache/spark/pull/28313#discussion_r413991291
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
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@@ -1622,7 +1622,15 @@ trait TruncInstant extends BinaryExpression with
ImplicitCastInputTypes {
@ExpressionDescription(
usage = """
_FUNC_(date, fmt) - Returns `date` with the time portion of the day
truncated to the unit specified by the format model `fmt`.
- `fmt` should be one of ["week", "mon", "month", "mm", "quarter", "year",
"yyyy", "yy", "decade", "century", "millennium"]
+ """,
+ arguments = """
+ Arguments:
+ * date - date value or valid date string
+ * fmt - the format representing the unit to be truncated to
+ - "YEAR", "YYYY", "YY" - truncate to the first date of the year
+ - "QUARTER" - truncate to the closest quarter start date
+ - "MONTH", "MM", "MON" - truncate to the first date of the month
+ - "WEEK" - truncate to the closest Monday
Review comment:
my mistake.
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