Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17901#discussion_r115401280
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -1212,22 +1209,27 @@ case class ParseToDate(left: Expression, format:
Option[Expression], child: Expr
/**
* Parses a column to a timestamp based on the supplied format.
*/
-// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "_FUNC_(timestamp, fmt) - Parses the `left` expression with the
`format` expression to a timestamp. Returns null with invalid input.",
+ usage = """
+ _FUNC_(timestamp[, fmt]) - Parses the `timestamp` expression with the
`format` expression to
+ a timestamp. Returns null with invalid input. Default `fmt` is
'yyyy-MM-dd HH:mm:ss'.
--- End diff --
shall we follow `to_date` and using the casting rules if the format is not
specified?
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