CreateQuery discounts (children 3)
 Identifier discounts
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration advertiser_id (children 1)
    DataType UInt64
   ColumnDeclaration discount_start_date (children 1)
    DataType Date
   ColumnDeclaration discount_end_date (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Date
   ColumnDeclaration amount (children 1)
    DataType Float64
 Storage definition (children 1)
  Function Memory
