Disable optimization by default

src/Core/Settings.cpp

@@ -5722,7 +5722,7 @@ Allow writing simple SELECT queries without the leading SELECT keyword, which ma
 
 In `clickhouse-local` it is enabled by default and can be explicitly disabled.
 )", 0) \
-    DECLARE(Bool, optimize_extract_common_expressions, true, R"(
+    DECLARE(Bool, optimize_extract_common_expressions, false, R"(
 Allow extracting common expressions from disjunctions in WHERE and ON expressions. A logical expression like `(A AND B) OR (A AND C)` can be rewritten to `A AND (B OR C)`, which might help to utilize:
 - indices in simple filtering expressions
 - cross to inner join optimization

src/Core/SettingsChangesHistory.cpp

@@ -81,7 +81,7 @@ static std::initializer_list<std::pair<ClickHouseVersion, SettingsChangesHistory
             {"filesystem_cache_skip_download_if_exceeds_per_query_cache_write_limit", 1, 1, "Rename of setting skip_download_if_exceeds_query_cache_limit"},
             {"filesystem_cache_prefer_bigger_buffer_size", true, true, "New setting"},
             {"read_in_order_use_virtual_row", false, false, "Use virtual row while reading in order of primary key or its monotonic function fashion. It is useful when searching over multiple parts as only relevant ones are touched."},
-            {"optimize_extract_common_expressions", false, true, "Optimize WHERE and ON expressions by extracting common expressions out from disjunction of conjunctions."},
+            {"optimize_extract_common_expressions", false, false, "Introduce setting to optimize WHERE and ON expressions by extracting common expressions out from disjunction of conjunctions."},
         }
     },
     {"24.10",