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

     1  select cast('2020-02-01' as date) + NULL;
     2  cast(2020-02-01 as date) + null
     3  NULL
     4  select 1 + NULL;
     5  1 + null
     6  NULL
     7  select NULL + 1;
     8  null + 1
     9  NULL
    10  select NULL + cast('2020-02-01 00:00:00' as datetime);
    11  null + cast(2020-02-01 00:00:00 as date)
    12  NULL