CreateQuery date_table (children 3)
 Identifier date_table
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration CountryID (children 1)
    DataType UInt64
   ColumnDeclaration StartDate (children 1)
    DataType Date
   ColumnDeclaration EndDate (children 1)
    DataType Date
   ColumnDeclaration Tax (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Float64
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier CountryID