imay commented on a change in pull request #3439:
URL: https://github.com/apache/incubator-doris/pull/3439#discussion_r419844026
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File path:
docs/en/sql-reference/sql-functions/string-functions/append_trailing_char_if_absent.md
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@@ -0,0 +1,58 @@
+---
+{
+ "title": "append_trailing_char_if_absent",
+ "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.
+-->
+
+# append_trailing_char_if_absent
+## description
+### Syntax
+
+`VARCHAR append_trailing_char_if_absent(VARCHAR str, VARCHAR trailing_char)`
+
+If the s string is non-empty and does not contain the c character at the end,
it appends the c character to the end.
+Trailing_char contains only one character, and it will report an error if
contains more than one character
Review comment:
Why not return null when the second parameter length is not 1.
You can't check its length if it is not const, such as a table column.
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