Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/15847#discussion_r87620051
--- 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 --
This is a variable so it can't be lazily initialized.
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