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Previously, readCommandResponse() stored every column with PQgetvalue(), which returns an empty string for the SQL NULL value. An empty string is not a valid value in the pgbench expression language, and when returned by the server it was also indistinguishable from a NULL. When receiving a value, pgbench now checks for PQgetisnull() and sets a NULL value with setNullValue() before saving it. This behavior is more consistent with \set, making the result saved testable with IS NULL. This is a quality-of-life improvement, so no backpatch is done. Author: Shinya Kato <shinya11.kato@gmail.com> Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reviewed-by: Shihao Zhong <zhong950419@gmail.com> Discussion: https://postgr.es/m/CAOzEurT9J9QMmpJt_8pWZCziNYCUHOD=c-hoccOVYJLc_VxVRg@mail.gmail.com