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