From 072a68f8ab9cd5c043cc147eef945791d686bf45 Mon Sep 17 00:00:00 2001
From: hexiaoting <hewenting_ict@163.com>
Date: Fri, 12 Mar 2021 16:08:16 +0800
Subject: [PATCH] Fix build error

---
 src/DataTypes/DataTypeLowCardinalityHelpers.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/DataTypes/DataTypeLowCardinalityHelpers.cpp b/src/DataTypes/DataTypeLowCardinalityHelpers.cpp
index 80d154b6234..41ba81814d0 100644
--- a/src/DataTypes/DataTypeLowCardinalityHelpers.cpp
+++ b/src/DataTypes/DataTypeLowCardinalityHelpers.cpp
@@ -87,7 +87,7 @@ ColumnPtr recursiveRemoveLowCardinality(const ColumnPtr & column)
 
     if (const auto * column_map = typeid_cast<const ColumnMap *>(column.get()))
     {
-        auto nested = column_map->getNestedColumnPtr();
+        const auto & nested = column_map->getNestedColumnPtr();
         auto nested_no_lc = recursiveRemoveLowCardinality(nested);
         if (nested.get() == nested_no_lc.get())
             return column;