Fix for errors on every query because of the engine column

Author: matt-aitken

internal-packages/tsql/src/query/printer.ts

@@ -1423,6 +1423,14 @@ export class ClickHousePrinter {
           if (environmentId) this.allowedInternalColumns.add(environmentId);
         }
 
+        // Register required filter columns as allowed internal columns
+        // These are ClickHouse columns used for internal filtering (e.g., engine = 'V2')
+        if (tableSchema.requiredFilters) {
+          for (const filter of tableSchema.requiredFilters) {
+            this.allowedInternalColumns.add(filter.column);
+          }
+        }
+
         // Add tenant isolation guard
         extraWhere = this.createTenantGuard(tableSchema, effectiveAlias);
       } else if (