sparse index
常见例句
- Currently a sparse index can have only one field.
目前，Sparse索引衹能有一個字段。 - Covering indexes allow data storage within the index itself while sparse indexes exclude documents that do not contain the missing field.
Covered索引允許在索引本身裡存儲數據，而 Sparse索引則會排除掉不包含索引字段的文档。 返回 sparse index