AMashenkov commented on code in PR #1109:
URL: https://github.com/apache/ignite-3/pull/1109#discussion_r977801077


##########
modules/schema/src/main/java/org/apache/ignite/internal/schema/configuration/ColumnTypeValidatorImpl.java:
##########
@@ -53,11 +50,81 @@ public void validate(ColumnTypeValidator annotation, 
ValidationContext<ColumnTyp
                 || newType.precision() != oldType.precision()
                 || newType.scale() != oldType.scale()
                 || newType.length() != oldType.length()) {
-            ctx.addIssue(new ValidationIssue(ctx.currentKey(), "Unsupported 
column type change: " + ctx.currentKey()));
+            ColumnView columnView = ctx.getNewOwner();
+
+            assert columnView != null;
+
+            ctx.addIssue(new ValidationIssue(columnView.name(), "Column type 
can't be changed"));
         }
 
     }
 
+    private void validateLength(ValidationContext<ColumnTypeView> ctx, 
ColumnTypeView typeView) {
+        switch (typeView.type()) {
+            case "STRING":
+            case "BYTES":
+            case "BITMASK":
+                if (typeView.length() <= 0) {
+                    ColumnView columnView = ctx.getNewOwner();
+
+                    assert columnView != null;
+
+                    ctx.addIssue(new ValidationIssue(columnView.name(), 
"Length must by positive"));

Review Comment:
   ```suggestion
                       ctx.addIssue(new ValidationIssue(columnView.name(), 
"Length must bу positive"));
   ```



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