From documentation:
Sometimes the “during query” form happens when millions of rows are being sent as part of one or more queries. If you know that this is happening, you should try increasing net_read_timeout from its default of 30 seconds to 60 seconds or longer, sufficient for the data transfer to complete.
For Further reading here is documentation link:
[URL]https://dev.mysql.com/doc/refman/5.6/en/error-lost-connection.html[/URL]