pengxiangyu commented on a change in pull request #6154:
URL: https://github.com/apache/incubator-doris/pull/6154#discussion_r666647298
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File path: docs/zh-CN/administrator-guide/runtime-filter.md
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+---
+{
+ "title": "Runtime Filter",
+ "language": "zh-CN"
+}
+---
+
+<!--
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+ http://www.apache.org/licenses/LICENSE-2.0
+
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+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Runtime Filter
+Runtime Filter 是在 Doris 0.15 版本中正式加入的新功能。旨在为某些 Join
查询在运行时动态生成过滤条件，来减少扫描的数据量，避免不必要的I/O和网络传输，从而加速查询。
+
+它的设计、实现和效果可以参阅 [ISSUE
6116](https://github.com/apache/incubator-doris/issues/6116)。
+
+## 名词解释
+* FE：Frontend，Doris 的前端节点。负责元数据管理和请求接入。
+* BE：Backend，Doris 的后端节点。负责查询执行和数据存储。
+* 左表：Join查询时，左边的表。进行Probe操作。可被Join Reorder调整顺序。
+* 右表：Join查询时，右边的表。进行Build操作。可被Join Reorder调整顺序。
+* Fragment：FE会将具体的SQL语句的执行转化为对应的Fragment并下发到BE进行执行。BE上执行对应Fragment，并将结果汇聚返回给FE。
+* Join on clause: `A join B on A.a=B.b`中的`A.a=B.b`，在查询规划时基于此生成join
conjuncts，包含join Build和Probe使用的expr，其中Build expr在Runtime Filter中称为src
expr，Probe expr在Runtime Filter中称为target expr。
+
+## 原理
+Runtime Filter在查询规划时生成，在HashJoinNode中构建，在ScanNode中应用。
+
+举个例子，当前存在T1表与T2表的Join查询，它的Join方式为HashJoin，T1是一张事实表，数据行数为100000，T2是一张维度表，数据行数为100，Doris
join的实际情况是:
Review comment:
是100还是2000？
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