Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17052#discussion_r103385054
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1119,11 +1119,16 @@ case class DecimalAggregates(conf: CatalystConf)
extends Rule[LogicalPlan] {
*/
object ConvertToLocalRelation extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
- case Project(projectList, LocalRelation(output, data))
+ case Project(projectList, lr @ LocalRelation(output, data))
if !projectList.exists(hasUnevaluableExpr) =>
val projection = new InterpretedProjection(projectList, output)
projection.initialize(0)
- LocalRelation(projectList.map(_.toAttribute), data.map(projection))
+ if (lr.isStreaming) {
+ LocalRelation(projectList.map(_.toAttribute), data.map(projection))
+ .setIncremental()
+ } else {
+ LocalRelation(projectList.map(_.toAttribute), data.map(projection))
+ }
}
--- End diff --
In a streaming query, we will transfrom stream source to a batch
`LocalRelation` whose `isStreaming` is true, so we should keep new
LocalRelation's `isStreaming` is true in this rule.
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