CreateQuery t_nul (children 3)
 Identifier t_nul
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration n (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UInt32
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
  Set