legacy/src/main/java/org/opensearch/sql/legacy/executor/ElasticResultHandler.java [20:38]:
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    private static Object deepSearchInMap(Map<String, Object> fieldsMap, String name) {
        if (name.contains(".")) {
            String[] path = name.split("\\.");
            Map<String, Object> currentObject = fieldsMap;
            for (int i = 0; i < path.length - 1; i++) {
                Object valueFromCurrentMap = currentObject.get(path[i]);
                if (valueFromCurrentMap == null) {
                    return null;
                }
                if (!Map.class.isAssignableFrom(valueFromCurrentMap.getClass())) {
                    return null;
                }
                currentObject = (Map<String, Object>) valueFromCurrentMap;
            }
            return currentObject.get(path[path.length - 1]);
        }

        return fieldsMap.get(name);
    }
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legacy/src/main/java/org/opensearch/sql/legacy/executor/join/ElasticJoinExecutor.java [158:176]:
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    protected Object deepSearchInMap(Map<String, Object> fieldsMap, String name) {
        if (name.contains(".")) {
            String[] path = name.split("\\.");
            Map<String, Object> currentObject = fieldsMap;
            for (int i = 0; i < path.length - 1; i++) {
                Object valueFromCurrentMap = currentObject.get(path[i]);
                if (valueFromCurrentMap == null) {
                    return null;
                }
                if (!Map.class.isAssignableFrom(valueFromCurrentMap.getClass())) {
                    return null;
                }
                currentObject = (Map<String, Object>) valueFromCurrentMap;
            }
            return currentObject.get(path[path.length - 1]);
        }

        return fieldsMap.get(name);
    }
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