morningman commented on code in PR #14396:
URL: https://github.com/apache/doris/pull/14396#discussion_r1027305954
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docs/zh-CN/docs/sql-manual/sql-functions/width-bucket.md:
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@@ -0,0 +1,153 @@
+---
+{
+ "title": "width_bucket",
+ "language": "zh-CN"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"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.
+-->
+
+## width_bucket
+
+### Description
+
+构造等宽直方图，其中直方图范围被划分为相同大小的区间，并在计算后返回表达式的值所在的桶号。该函数返回一个整数值或空值（如果任何输入为空值则返回空值）。
+
+#### Syntax
+
+```sql
+width_bucket(expr, min_value, max_value, num_buckets)
+```
+
+#### Arguments
+`expr` -
+创建直方图的表达式。此表达式必须计算为数值或可隐式转换为数值的值。
Review Comment:
这里说必须是数值，但是下面的示例中，可以使用 `date` 类型？
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