add option to force deduplicate children

dbms/src/Core/Settings.h

@@ -395,6 +395,7 @@ struct Settings : public SettingsCollection<Settings>
     M(SettingBool, enable_early_constant_folding, true, "Enable query optimization where we analyze function and subqueries results and rewrite query if there're constants there", 0) \
     \
     M(SettingBool, partial_revokes, false, "Makes it possible to revoke privileges partially.", 0) \
+    M(SettingBool, force_deduplicate_childrens, false, "If the 'root' table deduplicates blocks, there are no need to make deduplication for children. Use true to always deduplicate childrens.", 0) \
     \
     /** Obsolete settings that do nothing but left for compatibility reasons. Remove each one after half a year of obsolescence. */ \
     \

dbms/src/DataStreams/PushingToViewsBlockOutputStream.cpp

@@ -29,7 +29,9 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
 
     /// If the "root" table deduplactes blocks, there are no need to make deduplication for children
     /// Moreover, deduplication for AggregatingMergeTree children could produce false positives due to low size of inserting blocks
-    bool disable_deduplication_for_children = !no_destination && storage->supportsDeduplication();
+    bool disable_deduplication_for_children = false;
+    if (!context.getSettingsRef().force_deduplicate_childrens)
+        disable_deduplication_for_children = !no_destination && storage->supportsDeduplication();
 
     auto table_id = storage->getStorageID();
     Dependencies dependencies = context.getDependencies(table_id);
@@ -130,7 +132,7 @@ void PushingToViewsBlockOutputStream::write(const Block & block)
     }
 
     /// Don't process materialized views if this block is duplicate
-    if (replicated_output && replicated_output->lastBlockIsDuplicate())
+    if (!context.getSettingsRef().force_deduplicate_childrens && replicated_output && replicated_output->lastBlockIsDuplicate())
         return;
 
     // Insert data into materialized views only after successful insert into main table