From 4efc7a7dc3b08ffbb0e454deed41e615152fa30a Mon Sep 17 00:00:00 2001
From: alexey-milovidov <milovidov@yandex-team.ru>
Date: Sat, 16 Jan 2021 13:07:58 +0300
Subject: [PATCH] Update MergeTreeIOSettings.h

---
 src/Storages/MergeTree/MergeTreeIOSettings.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Storages/MergeTree/MergeTreeIOSettings.h b/src/Storages/MergeTree/MergeTreeIOSettings.h
index db2a84b4363..d82aa7dd7c2 100644
--- a/src/Storages/MergeTree/MergeTreeIOSettings.h
+++ b/src/Storages/MergeTree/MergeTreeIOSettings.h
@@ -14,6 +14,7 @@ struct MergeTreeReaderSettings
     /// If save_marks_in_cache is false, then, if marks are not in cache,
     ///  we will load them but won't save in the cache, to avoid evicting other data.
     bool save_marks_in_cache = false;
+    /// Convert old-style nested (single arrays with same prefix, `n.a`, `n.b`...) to subcolumns of data type Nested.
     bool convert_nested_to_subcolumns = false;
 };