当对非ascii字符建立索引时，最大字符长度将减少。

The maximum character length will be reduced when non-ASCII characters are indexed.

youdao

如果使用可空的varchar列并只涉及ASCII字符(在utf - 8格式中每字符1字节)，那么可以建立索引的最大字符长度是1021个字符。

If you use a nullable VARCHAR column and only ASCII characters (UTF-8 format 1 byte per character) involved, the maximum character length that can be indexed is 1021 characters.

youdao

您可以使用——show - limits选项显示xargs的默认限制，然后使用- s选项将输出命令的长度限制在允许的最大字符串数量之内。

You can use the — show-limits option to display the default limits of xargs, and the -s option to limit the size of output commands to a specific maximum number of characters.

youdao