CDRIVER-5969 return NULL result if no writes indicated #1990
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Summary
Return NULL
mongoc_bulkwrite_result_t
if no server reply indicated writes were attempted.Verified by this patch build.
Background & Motivation
Quoting Bulk Write spec:
The C driver incorrectly assumed the absence of errors indicated a successful write. But a client-side error could be returned before any attempts to send writes.
This PR includes an additional check to ensure an
ok:1
server reply was received and parsed to indicate the server attempted writes.