mongoc_collection_keys_to_index_string()
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Synopsis
char * mongoc_collection_keys_to_index_string (const bson_t *keys);
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Description
This function shall returns the canonical stringification, as used in mongoc_collection_create_index() without an explicit name, of a given key specification.
It is a programming error to call this function on a non-standard index, such one other than a straight index with ascending and descending.
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Returns
A string that should be freed with bson_free().