github.com/matrixorigin/matrixone@v1.2.0/test/distributed/resources/load_data/set_null_3.csv (about)

     1  1,"a"
     2  2,"b"
     3  null,"c"
     4  null,"d"
     5  5,"e"
     6  6,"f"
     7  null,"g"
     8  null,"null"