github.com/matrixorigin/matrixone@v1.2.0/test/distributed/cases/operator/math_operator.test (about)

     1  select cast('2020-02-01' as date) + NULL;
     2  select 1 + NULL;
     3  select NULL + 1;
     4  select NULL + cast('2020-02-01 00:00:00' as datetime);