The error #1038 - Out of sort memory, consider increasing server sort buffer size is an indication that MySQL's internal memory allocation for sorting data has been exhausted. MySQL uses a buffer to sort data, and when the amount of data being sorted exceeds the available buffer size, the server can't complete the operation, leading to this error.
The primary solution to this problem is to increase the sort_buffer_size in your MySQL configuration. This buffer is used by MySQL to sort data, and increasing its size can help the server handle larger sorting operations.