Failed to serialize SqlNode to json string using jackson

Failed to serialize SqlNode to json string using jackson, Exception as follows：

Caused by: java.lang.UnsupportedOperationException: class org.apache.calcite.sql.SqlSelectOperator: SELECT
at org.apache.calcite.util.Util.needToImplement(Util.java:967)
at org.apache.calcite.sql.SqlOperator.getOperandCountRange(SqlOperator.java:201)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:664)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689)
... 32 more