CreateQuery null_in__fuzz_6 (children 3)
 Identifier null_in__fuzz_6
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration dt (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType UInt16
   ColumnDeclaration idx (children 1)
    DataType Int32
   ColumnDeclaration i (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int256
   ColumnDeclaration s (children 1)
    DataType Int32
 Storage definition (children 3)
  Function MergeTree
  Identifier dt
  Identifier idx
