changed default value for CASSANDRA_QUERY_SET_NULL_VALUES_ENABLED from false to true

application/src/main/resources/thingsboard.yml

@@ -309,7 +309,7 @@ cassandra:
     # Interval in milliseconds for printing Cassandra query queue statistic
     rate_limit_print_interval_ms: "${CASSANDRA_QUERY_RATE_LIMIT_PRINT_MS:10000}"
     # set all data type values except target to null for the same ts on save
-    set_null_values_enabled: "${CASSANDRA_QUERY_SET_NULL_VALUES_ENABLED:false}"
+    set_null_values_enabled: "${CASSANDRA_QUERY_SET_NULL_VALUES_ENABLED:true}"
     # log one of cassandra queries with specified frequency (0 - logging is disabled)
     print_queries_freq: "${CASSANDRA_QUERY_PRINT_FREQ:0}"
     tenant_rate_limits: