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* feat: add IF EXISTS for DROP For https://github.com/GreptimeTeam/greptimedb/issues/2794 * generate code Signed-off-by: Ruihang Xia <waynestxia@gmail.com> --------- Signed-off-by: Ruihang Xia <waynestxia@gmail.com> Co-authored-by: Ruihang Xia <waynestxia@gmail.com>