Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/14788#discussion_r77960352
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -72,58 +72,64 @@ case class CurrentTimestamp() extends LeafExpression
with CodegenFallback {
}
/**
- * Adds a number of days to startdate.
+ * The base for addition/subtraction for days.
--- End diff --
It seems a bit messy here. I made a common parent for `AddDays` and
`SubDays` named `AddDaysBase`.
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