Using an array of IDs to select rows instead of an array of objects

[AlexeyEsin]

Right now, selectedRecords is an array of objects of the same type as records, which is why you have to use a lot of memory. In the worst case, when all records in the table are selected, a copy of the records array is stored in memory. To reduce memory costs, an array of IDs could be used. It would be nice to add such an option.