KurtYoung commented on a change in pull request #10452: 
[FLINK-15035][table-planner-blink] Introduce unknown memory setting to table in 
blink planner
URL: https://github.com/apache/flink/pull/10452#discussion_r355095936
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/nodes/exec/BatchExecNode.scala
 ##########
 @@ -32,4 +33,13 @@ trait BatchExecNode[T] extends ExecNode[BatchPlanner, T] 
with Logging {
     */
   def getDamBehavior: DamBehavior
 
+  def setManagedMemoryWeight[X](
+      transformation: Transformation[X], memoryBytes: Long): Transformation[X] 
= {
+    // Using Bytes can easily overflow
+    // Using MebiBytes to cast to int
+    // Careful about zero
+    val memoryMB = Math.max(1, (memoryBytes >> 20).toInt)
 
 Review comment:
   source & sink will be the bad case of managed memory, do we have a way to 
also set the managed memory to 0 for source & sink?

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