disable write_marks_for_substreams_in_compact_parts by default

zvonand · zvonand · commit 98b1107b14d7 · 2026-02-16T09:53:18.000+01:00
diff --git a/src/Core/SettingsChangesHistory.cpp b/src/Core/SettingsChangesHistory.cpp
@@ -875,7 +875,6 @@ const VersionToSettingsChangesMap & getMergeTreeSettingsChangesHistory()
             {"shared_merge_tree_virtual_parts_discovery_batch", 1, 1, "New setting"},
             {"max_digestion_size_per_segment", 256_MiB, 256_MiB, "Obsolete setting"},
             {"shared_merge_tree_update_replica_flags_delay_ms", 30000, 30000, "New setting"},
-            {"write_marks_for_substreams_in_compact_parts", false, true, "Enable writing marks for substreams in compact parts by default"},
             {"allow_part_offset_column_in_projections", false, true, "Now projections can use _part_offset column."},
             {"max_uncompressed_bytes_in_patches", 0, 30ULL * 1024 * 1024 * 1024, "New setting"},
         });
diff --git a/src/Storages/MergeTree/MergeTreeSettings.cpp b/src/Storages/MergeTree/MergeTreeSettings.cpp
@@ -289,7 +289,7 @@ namespace ErrorCodes
     - `v2`
     - `v3`
     )", 0) \
-    DECLARE(Bool, write_marks_for_substreams_in_compact_parts, true, R"(
+    DECLARE(Bool, write_marks_for_substreams_in_compact_parts, false, R"(
     Enables writing marks per each substream instead of per each column in Compact parts.
     It allows to read individual subcolumns from the data part efficiently.
     )", 0) \
