dblink_cancel_query — cancels any active query on the named connection
dblink_cancel_query(text connname) returns text
dblink_cancel_query attempts to
cancel any query that is in progress on the named connection. Note
that this is not certain to succeed (since, for example, the remote
query might already have finished). A cancel request simply
improves the odds that the query will fail soon. You must still
complete the normal query protocol, for example by calling
Name of the connection to use.
OK if the cancel request
has been sent, or the text of an error message on failure.
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