Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15847#discussion_r87541254
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1431,43 +1431,49 @@ case class FormatNumber(x: Expression, d:
Expression)
// Associated with the pattern, for the last d value, and we will update
the
// pattern (DecimalFormat) once the new coming d value differ with the
last one.
+ // This is an Option to distinguish between 0 (numberFormat is valid)
and uninitialized after
+ // serialization (numberFormat has not been updated for dValue = 0).
@transient
- private var lastDValue: Int = -100
+ private var lastDValue: Option[Int] = None
--- End diff --
Actually you can do this via a lazy val too, which is just
```
@transient private lazy var lastDValue: Int = -100
```
then I believe it gets initialized to -100 after deserialization
automatically.
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