of the risk that a
    constraint expression could evaluate differently on the local and remote
    servers.  Any such inconsistency in the behavior of a check
    constraint could lead to hard-to-detect errors in query optimization.
    So if you wish to import check constraints, you must do so
    manually, and you should verify the semantics of each one carefully.
    For more detail about the treatment of check constraints on
    foreign tables, see <a class="xref" href="sql-createforeigntable.html" tit