lincoln-lil commented on a change in pull request #15117:
URL: https://github.com/apache/flink/pull/15117#discussion_r594206522
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/nodes/calcite/Expand.scala
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@@ -79,7 +83,27 @@ abstract class Expand(
litmus.succeed()
}
- override def deriveRowType(): RelDataType = outputRowType
+ override def deriveRowType(): RelDataType = {
+ val fieldNullableMap = mutable.Map[Int, Boolean]()
+ projects.map {
+ project =>
+ project.zipWithIndex.map {
+ f => {
+ val nullable =
fieldNullableMap.get(f._2).getOrElse(f._1.getType.isNullable)
+ fieldNullableMap.put(f._2, nullable || f._1.getType.isNullable)
+ }
+ }
+ }
+ val typeList = ListBuffer[RelDataType]()
+ val typeFactory = cluster.getTypeFactory
+ projects.get(0).zipWithIndex.map {
Review comment:
good point！I'll try to investigate the two ways.
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