Make the fix more minimal

src/Interpreters/Cache/QueryCache.cpp

@@ -233,6 +233,7 @@ void QueryCache::Writer::buffer(Chunk && chunk, ChunkType chunk_type)
             auto & buffered_chunk = (chunk_type == ChunkType::Totals) ? query_result->totals : query_result->extremes;
 
             convertToFullIfSparse(chunk);
+            convertToFullIfConst(chunk);
 
             if (!buffered_chunk.has_value())
                 buffered_chunk = std::move(chunk);
@@ -279,7 +280,8 @@ void QueryCache::Writer::finalizeWrite()
 
         for (auto & chunk : query_result->chunks)
         {
-            convertToFullIfNeeded(chunk);
+            convertToFullIfSparse(chunk);
+            convertToFullIfConst(chunk);
 
             const size_t rows_chunk = chunk.getNumRows();
             if (rows_chunk == 0)

src/Processors/Chunk.cpp

@@ -212,30 +212,13 @@ void convertToFullIfConst(Chunk & chunk)
     chunk.setColumns(std::move(columns), num_rows);
 }
 
-void convertToFullIfLowCardinality(Chunk & chunk)
-{
-    size_t num_rows = chunk.getNumRows();
-    auto columns = chunk.detachColumns();
-    for (auto & column : columns)
-        column = recursiveRemoveLowCardinality(column);
-    chunk.setColumns(std::move(columns), num_rows);
-}
-
 void convertToFullIfSparse(Chunk & chunk)
 {
     size_t num_rows = chunk.getNumRows();
     auto columns = chunk.detachColumns();
     for (auto & column : columns)
         column = recursiveRemoveSparse(column);
-
     chunk.setColumns(std::move(columns), num_rows);
 }
 
-void convertToFullIfNeeded(Chunk & chunk)
-{
-    convertToFullIfSparse(chunk);
-    convertToFullIfConst(chunk);
-    convertToFullIfLowCardinality(chunk);
-}
-
 }

src/Processors/Chunk.h

@@ -150,8 +150,6 @@ private:
 /// or when you need to perform operation with two columns
 /// and their structure must be equal (e.g. compareAt).
 void convertToFullIfConst(Chunk & chunk);
-void convertToFullIfLowCardinality(Chunk & chunk);
 void convertToFullIfSparse(Chunk & chunk);
-void convertToFullIfNeeded(Chunk & chunk);
 
 }