Mryange commented on code in PR #2548:
URL: https://github.com/apache/doris-website/pull/2548#discussion_r2161313742
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docs/sql-manual/sql-functions/scalar-functions/json-functions/to-json.md:
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@@ -0,0 +1,158 @@
+---
+{
+ "title": "TO_JSON",
+ "language": "en"
+}
+---
+
+<!--
+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.
+-->
+
+## Description
+
+Converts Doris internal data types to JSONB type. This function allows for
converting compatible Doris data types into JSON representation without
precision loss.
+
+## Syntax
+
+```sql
+TO_JSON(value)
+```
+
+## Parameters
+
+| Parameter | Description |
+|-----------|-------------|
+| value | The value to be converted to JSONB type. Can be one of the types
compatible with JSON mapping. |
Review Comment:
理论上这个函数不会直接返回一个 json 的null。
不过可以返回一个json的array，array里面有null。
null这个是参考pg的行为。
输入一个sql的null，返回的也是一个sql的null。
https://dbfiddle.uk/rY6jDsEA
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