CreateQuery datetime64_issue (children 3)
 Identifier datetime64_issue
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType int
   ColumnDeclaration dt (children 1)
    DataType DateTime64 (children 1)
     ExpressionList (children 1)
      Literal UInt64_3
   ColumnDeclaration dtn (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType DateTime64 (children 1)
       ExpressionList (children 1)
        Literal UInt64_3
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier id
  Identifier id
