Backport #51064 to 23.5: Fix subtly broken copy-on-write of ColumnLow…

…Cardinality dictionary
ClickHouse · Jun 16, 2023 · 97ce646 · 97ce646
1 parent 6c6b3c8
commit 97ce646
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/Columns/ColumnLowCardinality.h b/src/Columns/ColumnLowCardinality.h
@@ -340,7 +340,7 @@ class ColumnLowCardinality final : public COWHelper<IColumn, ColumnLowCardinalit
         explicit Dictionary(MutableColumnPtr && column_unique, bool is_shared);
         explicit Dictionary(ColumnPtr column_unique, bool is_shared);
 
-        const ColumnPtr & getColumnUniquePtr() const { return column_unique; }
+        const WrappedPtr & getColumnUniquePtr() const { return column_unique; }
         WrappedPtr & getColumnUniquePtr() { return column_unique; }
 
         const IColumnUnique & getColumnUnique() const { return static_cast<const IColumnUnique &>(*column_unique); }