Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r49229231
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -63,7 +63,9 @@ abstract class Optimizer extends
RuleExecutor[LogicalPlan] {
RemoveDispensableExpressions,
SimplifyFilters,
SimplifyCasts,
- SimplifyCaseConversionExpressions) ::
+ SimplifyCaseConversionExpressions,
+ // Nondeterministic
+ ComputeCurrentTime) ::
--- End diff --
Yea, I think we need to make it evaluated before this batch. Otherwise,
constant folding rules will fire first, which can potentially introduce problem
(multiple CurrentTimestamps returns different answers in a query).
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