AMashenkov commented on code in PR #2964:
URL: https://github.com/apache/ignite-3/pull/2964#discussion_r1432823690


##########
modules/schema/src/main/java/org/apache/ignite/internal/schema/registry/UpgradingRowAdapter.java:
##########
@@ -160,7 +163,7 @@ public Byte byteValueBoxed(int colIdx) throws 
InvalidTypeException {
 
         Column column = mappedId < 0 ? mapper.mappedColumn(colIdx) : 
super.schema().column(mappedId);
 
-        if (NativeTypeSpec.INT8 != column.type().spec()) {
+        if (!isSupportedColumnTypeChange(column.type().spec().asColumnType(), 
ColumnType.INT8)) {

Review Comment:
   ```suggestion
          ensureColumnOfValidType(column.type().spec().asColumnType(), 
ColumnType.INT8);
   ```
   Let's move this check to a separate method:
   ```
   void ensureColumnOfValidType(ColumnType from, ColumnType to) {
       if (!isSupportedColumnTypeChange(from ,to)) {
           throw new SchemaException("Type conversion is not allowed: {} -> 
{}", from, to);
       }
   }
   ```



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