release-21.2: sql,csv: distinguish empty columns from quoted empty strings in COPY #86148
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Backport 1/2 commits from #84487.
/cc @cockroachdb/release
Release justification: bug fix
Release note (bug fix): Previously, an empty column in the input to
COPY ... FROM CSV would be treated as an empty string. Now, this is
treated as NULL. The quoted empty string can still be used to input an
empty string, Similarly, if a different NULL token is specified in
the command options, it can be quoted in order to be treated as the
equivalent string value.