Merge pull request #108 from Enmk/fix_LowCardinality_tests

Fixed test if server sends X instead of LowCardinality(X)

Author: Enmk

ut/performance_tests.cpp

@@ -221,7 +221,21 @@ TYPED_TEST_P(ColumnPerformanceTest, InsertAndSelect) {
             EXPECT_EQ(1u, block.GetColumnCount());
             const auto col = block[0]->As<ColumnType>();
 
-            EXPECT_NO_FATAL_FAILURE(ValidateColumnItems(*col, ITEMS_COUNT));
+            if (col.get() == 0)
+            {
+                // If server doesn't send response back as LowCardinality(X) but rather like X.
+                if constexpr (std::is_base_of_v<ColumnLowCardinality, ColumnType>)
+                {
+                    using NestedColumnType = typename ColumnType::WrappedColumnType;
+                    EXPECT_NO_FATAL_FAILURE(ValidateColumnItems(*block[0]->As<NestedColumnType>(), ITEMS_COUNT));
+                }
+                else
+                    FAIL();
+            }
+            else
+            {
+                EXPECT_NO_FATAL_FAILURE(ValidateColumnItems(*col, ITEMS_COUNT));
+            }
             inner_loop_duration += timer.Elapsed();
         });