Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/15949#discussion_r89230158
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -72,6 +71,30 @@ 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(timestampMs: Long, dataType: DataType)
+ extends LeafExpression with Nondeterministic with CodegenFallback {
+
+ override def nullable: Boolean = false
+
+ override def prettyName: String = "current_batch_timestamp"
+
+ override protected def initializeInternal(partitionIndex: Int): Unit = {}
+
+ override protected def evalInternal(input: InternalRow): Any =
timestampMs
--- End diff --
Could you throw an exception like `throw new
UnsupportedOperationException(s"Cannot evaluate expression: $this")` here?
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