EmmyMiao87 commented on a change in pull request #3739:
URL: https://github.com/apache/incubator-doris/pull/3739#discussion_r436566495



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File path: be/src/olap/schema_change.cpp
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@@ -1383,6 +1463,15 @@ OLAPStatus 
SchemaChangeHandler::_do_process_alter_tablet_v2(const TAlterTabletRe
         sc_params.new_tablet = new_tablet;
         sc_params.ref_rowset_readers = rs_readers;
         sc_params.delete_handler = delete_handler;
+        if (request.__isset.materialized_view_params) {
+            for (auto item : request.materialized_view_params) {
+                AlterMaterializedViewParam mvParams;

Review comment:
       Encapsulate the logic here. There will be many new rules for converting 
expressions into strings




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