Merge branch '1.10_release_4.1.x' into 1.10_release_4.2.x

Author: gituser

core/src/main/java/com/dtstack/flink/sql/format/dtnest/DtNestRowDeserializationSchema.java

@@ -225,7 +225,7 @@ private Row convertTopRow() {
                 JsonNode node = getIgnoreCase(fieldNames[i]);
                 AbstractTableInfo.FieldExtraInfo fieldExtraInfo = fieldExtraInfos.get(i);
 
-                if (node == null) {
+                if (node == null || node instanceof NullNode) {
                     if (fieldExtraInfo != null && fieldExtraInfo.getNotNull()) {
                         throw new IllegalStateException("Failed to find field with name '"
                                 + fieldNames[i] + "'.");