release-20.2: sql: safeguard against nil fetcher in GetBytesRead #58210
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This crash can happen if a scan is finished early; I ran into it while
running logic tests with statement diagnostics enabled on all queries.
Note that this safeguard already exists on master.
Release note (bug fix): fixed a potential "nil pointer dereference"
panic when collecting diagnostics on certain queries.
/cc @cockroachdb/release