davisusanibar commented on code in PR #37723:
URL: https://github.com/apache/arrow/pull/37723#discussion_r1434220044


##########
java/memory/memory-core/src/main/java/org/apache/arrow/memory/Accountant.java:
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@@ -72,13 +73,13 @@ public Accountant(Accountant parent, String name, long 
reservation, long maxAllo
     this.reservation = reservation;
     this.allocationLimit.set(maxAllocation);
 
-    if (reservation != 0) {
+    if (reservation != 0 && parent != null) {

Review Comment:
   `parentAllocator` looks like to be nullable at 
https://github.com/davisusanibar/arrow/blob/2092e18752a9c0494799493b12eb1830052217a2/java/memory/memory-core/src/main/java/org/apache/arrow/memory/RootAllocator.java#L61



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