[GitHub] [calcite] rubenada commented on a change in pull request #2083: [CALCITE-4139] Prevent NPE in ListTransientTable

[GitBox <gi...@apache.org>]

rubenada commented on a change in pull request #2083:
URL: https://github.com/apache/calcite/pull/2083#discussion_r460677678



##########
File path: core/src/main/java/org/apache/calcite/schema/impl/ListTransientTable.java
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@@ -99,6 +99,9 @@ public ListTransientTable(String name, RelDataType rowType) {
           // TODO cleaner way to handle non-array objects?
           @Override public Object[] current() {
             Object current = list.get(i);
+            if (current == null) {
+              return null;
+            }

Review comment:
       ListTransientTable is currently used in combination with repeatUnion to support recursive queries. So we could get to this scenario if we have a null involved in the repeatUnion.




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