mongoc_bulkwriteopts_set_let - Man Page

void
mongoc_bulkwriteopts_set_let (mongoc_bulkwriteopts_t *self, const bson_t *let);

let is a map of parameter names and values to apply to all operations within the bulk write. Value must be constant or closed expressions that do not reference document fields. Parameters can then be accessed as variables in an aggregate expression context (e.g. "$$var").

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