AMashenkov commented on a change in pull request #201:
URL: https://github.com/apache/ignite-3/pull/201#discussion_r672185101



##########
File path: 
modules/schema/src/main/java/org/apache/ignite/internal/schema/SchemaManager.java
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@@ -283,9 +285,9 @@ private ColumnMapper columnMapper(
                     continue;
 
                 if (mapper == null)
-                    mapper = ColumnMapping.mapperBuilder(newDesc.length());
+                    mapper = ColumnMapping.mapperBuilder(newDesc);
 
-                mapper.add(newCol.schemaIndex(), oldCol.schemaIndex());
+                mapper.add(newCol.schemaIndex(), oldCol.schemaIndex(), null);

Review comment:
       Actually, the column will be ignored on merging. I wasn't able a test to 
get NPE here.
   Maybe we should extend tests with more complex cases involving cleanup an 
old schema version.
   
   I think you are right, the arg mustn't be 'null'.




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