yangzhg commented on a change in pull request #6817:
URL: https://github.com/apache/incubator-doris/pull/6817#discussion_r727675039
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File path:
docs/zh-CN/sql-reference-v2/sql-statements/Data-Definition-Statements/Create/CREATE-TABLE.md
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@@ -108,11 +108,12 @@ distribution_info
MIN：求最小值。适合数值类型。
MAX：求最大值。适合数值类型。
REPLACE：替换。对于维度列相同的行，指标列会按照导入的先后顺序，后倒入的替换先导入的。
- REPLACE_IF_NOT_NULL：非空值替换。和 REPLACE 的区别在于对于null值，不做替换。
+ REPLACE_IF_NOT_NULL：非空值替换。和 REPLACE
的区别在于对于null值，不做替换。这里要注意的是字段默认值要给NULL，而不是能空字符串，如果是空字符串，会给你替换成空字符串
Review comment:
```suggestion
REPLACE_IF_NOT_NULL：非空值替换。和 REPLACE
的区别在于对于null值，不做替换。这里要注意的是字段默认值要给NULL，而不能是空字符串，如果是空字符串，会给你替换成空字符串
```
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