CreateQuery date_interval (children 3)
 Identifier date_interval
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType String
   ColumnDeclaration start (children 1)
    DataType Date
   ColumnDeclaration end (children 1)
    DataType Date
 Storage definition (children 2)
  Function MergeTree
  Identifier start
