Github user tcondie commented on a diff in the pull request:
https://github.com/apache/spark/pull/15949#discussion_r89208121
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -72,6 +72,26 @@ case class CurrentTimestamp() extends LeafExpression
with CodegenFallback {
}
/**
+ * Expression representing the current batch time, which is used by
StreamExecution to
+ * 1. prevent optimizer from pushing this expression below a stateful
operator
+ * 2. allow IncrementalExecution to substitute this expression with a
Literal(timestamp)
+ *
+ * There is no code generation since this expression should be replaced
with a literal.
+ */
+case class CurrentBatchTimestamp(timestamp: SQLTimestamp) extends
LeafExpression
--- End diff --
Both Nondeterministic and Unevaluable have final 'eval' methods, so both
cannot be mixed in, and I need Nondeterministic to avoid optimizer pushdown.
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