Github user Serhii-Harnyk commented on a diff in the pull request:
https://github.com/apache/drill/pull/594#discussion_r84507055
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/vector/complex/fn/JsonReader.java
---
@@ -56,6 +58,12 @@
private final boolean readNumbersAsDouble;
/**
+ * Collection for tracking nullable fields during reading
+ * and storing them for creating default typed vectors
+ */
+ private final Set<String> nullableFields = Sets.newLinkedHashSet();
--- End diff --
We need to store an order of nullable fields.
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