morrySnow commented on code in PR #16778:
URL: https://github.com/apache/doris/pull/16778#discussion_r1106766558


##########
fe/fe-core/src/main/java/org/apache/doris/analysis/ColumnDef.java:
##########
@@ -141,6 +141,11 @@ public ColumnDef(String name, TypeDef typeDef, boolean 
isKey, AggregateType aggr
         this.defaultValue = defaultValue;
         this.comment = comment;
         this.visible = visible;
+        // if typeDef is NULL_TYPE, be will core when executing CTAS 
expression, we change it to tinyint nullable.

Review Comment:
   i think u need to fix this problem to mod the code in 
`org.apache.doris.datasource.InternalCatalog#createTableAsSelect`



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