Check error return of rows.Close(). #420
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According to
https://github.blog/2020-05-20-three-bugs-in-the-go-mysql-driver/, when
QueryContext is called with a context that is cancelled during scan, you
can receive incomplete or corrupted results. This can cause security bugs.
As I understand it, the corruption is fixed upstream, but it's still possible
to get incomplete results that will only show up in the error result from Close.
It's still possible and correct to call
defer rows.Close()
, since thedatabase/sql docs say this:
https://godoc.org/database/sql#Rows.Close