CreateQuery mview_backend (children 3)
 Identifier mview_backend
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration n (children 1)
    DataType Int32
   ColumnDeclaration n2 (children 1)
    DataType Int64
 Storage definition (children 3)
  Function MergeTree
  Identifier n
  Identifier n
