diff --git a/src/Storages/MergeTree/MergeTreeSettings.h b/src/Storages/MergeTree/MergeTreeSettings.h
index 49847617d30..9adbc1a7b3d 100644
--- a/src/Storages/MergeTree/MergeTreeSettings.h
+++ b/src/Storages/MergeTree/MergeTreeSettings.h
@@ -20,7 +20,7 @@ struct Settings;
     M(UInt64, index_granularity, 8192, "How many rows correspond to one primary key value.", 0) \
     \
     /** Data storing format settings. */ \
-    M(UInt64, min_bytes_for_wide_part, 0, "Minimal uncompressed size in bytes to create part in wide format instead of compact", 0) \
+    M(UInt64, min_bytes_for_wide_part, 10485760, "Minimal uncompressed size in bytes to create part in wide format instead of compact", 0) \
     M(UInt64, min_rows_for_wide_part, 0, "Minimal number of rows to create part in wide format instead of compact", 0) \
     M(UInt64, min_bytes_for_compact_part, 0, "Experimental. Minimal uncompressed size in bytes to create part in compact format instead of saving it in RAM", 0) \
     M(UInt64, min_rows_for_compact_part, 0, "Experimental. Minimal number of rows to create part in compact format instead of saving it in RAM", 0) \
@@ -97,6 +97,9 @@ struct Settings;
     M(String, storage_policy, "default", "Name of storage disk policy", 0) \
     M(Bool, allow_nullable_key, false, "Allow Nullable types as primary keys.", 0) \
     \
+    /** Settings for testing purposes */ \
+    M(Bool, randomize_part_type, false, "For testing purposes only. Randomizes part type between wide and compact", 0) \
+    \
     /** Obsolete settings. Kept for backward compatibility only. */ \
     M(UInt64, min_relative_delay_to_yield_leadership, 120, "Obsolete setting, does nothing.", 0) \
     M(UInt64, check_delay_period, 60, "Obsolete setting, does nothing.", 0) \
diff --git a/src/Storages/MergeTree/registerStorageMergeTree.cpp b/src/Storages/MergeTree/registerStorageMergeTree.cpp
index b0c422bd79f..5609c130aba 100644
--- a/src/Storages/MergeTree/registerStorageMergeTree.cpp
+++ b/src/Storages/MergeTree/registerStorageMergeTree.cpp
@@ -8,6 +8,7 @@
 #include <Common/Macros.h>
 #include <Common/OptimizedRegularExpression.h>
 #include <Common/typeid_cast.h>
+#include <Common/thread_local_rng.h>
 
 #include <Parsers/ASTCreateQuery.h>
 #include <Parsers/ASTExpressionList.h>
@@ -233,6 +234,25 @@ If you use the Replicated version of engines, see https://clickhouse.tech/docs/e
 }
 
 
+static void randomizePartTypeSettings(const std::unique_ptr<MergeTreeSettings> & storage_settings)
+{
+    static constexpr auto MAX_THRESHOLD_FOR_ROWS = 100000;
+    static constexpr auto MAX_THRESHOLD_FOR_BYTES = 1024 * 1024 * 10;
+
+    /// Create all parts in wide format with probability 1/3.
+    if (thread_local_rng() % 3 == 0)
+    {
+        storage_settings->min_rows_for_wide_part = 0;
+        storage_settings->min_bytes_for_wide_part = 0;
+    }
+    else
+    {
+        storage_settings->min_rows_for_wide_part = std::uniform_int_distribution{0, MAX_THRESHOLD_FOR_ROWS}(thread_local_rng);
+        storage_settings->min_bytes_for_wide_part = std::uniform_int_distribution{0, MAX_THRESHOLD_FOR_BYTES}(thread_local_rng);
+    }
+}
+
+
 static StoragePtr create(const StorageFactory::Arguments & args)
 {
     /** [Replicated][|Summing|Collapsing|Aggregating|Replacing|Graphite]MergeTree (2 * 7 combinations) engines
@@ -652,6 +672,20 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         ++arg_num;
     }
 
+    /// Allow to randomize part type for tests to cover more cases.
+    /// But if settings were set explicitly restrict it.
+    if (storage_settings->randomize_part_type
+        && !storage_settings->min_rows_for_wide_part.changed
+        && !storage_settings->min_bytes_for_wide_part.changed)
+    {
+        randomizePartTypeSettings(storage_settings);
+        LOG_INFO(&Poco::Logger::get(args.table_id.getNameForLogs() + " (registerStorageMergeTree)"),
+            "Applied setting 'randomize_part_type'. "
+            "Setting 'min_rows_for_wide_part' changed to {}. "
+            "Setting 'min_bytes_for_wide_part' changed to {}.",
+            storage_settings->min_rows_for_wide_part, storage_settings->min_bytes_for_wide_part);
+    }
+
     if (arg_num != arg_cnt)
         throw Exception("Wrong number of engine arguments.", ErrorCodes::BAD_ARGUMENTS);