calcite support bit operation

[18390992640]

Hello EveryOne ！
      I have seed calcite SqlKind.java source code, find that it hasn't bit 
operation.  so I want to ask why calcite don't support bit operation. for 
example, follow Query statement, it not support.
      select col_a, col_b from table_1 where (col_a & col_b) > 10.
        if I want to   extend calcite to supoort bit operation, how difficulty 
may be？
         who knwo this, please give me a help.  thanks very mush!