Revise FINAL processing documentation with settings update

Updated settings reference and performance tuning sections for FINAL processing with skip indexes. Added details on related settings and their defaults since various versions.

Author: BorisTyshkevich

content/en/altinity-kb-queries-and-syntax/altinity-kb-final-clause-speed.md

@@ -22,17 +22,6 @@ description: >
 * Since 25.12 - `apply_prewhere_after_final` and `apply_row_policy_after_final` settings for correct PREWHERE/row policy handling with FINAL
 * Since 26.2  - `enable_automatic_decision_for_merging_across_partitions_for_final=1` by default (auto-enables cross-partition optimization when safe)
 
-### Related Settings
-
-| Setting | Default | Since | Description |
-|---------|---------|-------|-------------|
-| `do_not_merge_across_partitions_select_final` | 0 | 20.10 | Skip cross-partition merging when partitions are pre-optimized |
-| `max_final_threads` | 0 (auto) | 20.5 | Thread limit for FINAL processing |
-| `enable_vertical_final` | 1 | 24.1 | Read columns in parallel from different parts |
-| `use_skip_indexes_if_final` | 1 | 25.6 | Allow skip indexes with FINAL |
-| `use_skip_indexes_if_final_exact_mode` | 1 | 25.6 | Rescan newer parts to ensure correctness with skip indexes |
-| `apply_prewhere_after_final` | 0 | 25.12 | Apply PREWHERE after deduplication (needed when PREWHERE references non-PK columns) |
-| `enable_automatic_decision_for_merging_across_partitions_for_final` | 1 | 26.2 | Auto-enable `do_not_merge_across_partitions_select_final` when partition key is in PK |
 
 ### Partitioning
 
@@ -109,6 +98,8 @@ SELECT count() FROM repl_tbl FINAL WHERE NOT ignore(*)
 
 ```
 
+Since 26.2, `enable_automatic_decision_for_merging_across_partitions_for_final=1` (default) auto-enables this when partition key columns are included in PRIMARY KEY
+
 ### Light ORDER BY 
 
 All columns specified in ORDER BY will be read during FINAL processing, creating additional disk load.  Use fewer columns and lighter column types to create faster queries.
@@ -156,16 +147,19 @@ Use these settings when needed:
 
 Example problem: if you have `ReplacingMergeTree` with a `deleted` column and PREWHERE filters on it, without `apply_prewhere_after_final=1` you may get wrong results because PREWHERE sees rows before FINAL picks the winner.
 
-### Performance Tuning
+### FINAL with skip indexes:
+- Both `use_skip_indexes_if_final` and `use_skip_indexes_if_final_exact_mode` are enabled by default since 25.6
+- Skip indexes on PRIMARY KEY columns have lower overhead (no extra rescan needed since 26.1), see [https://github.com/ClickHouse/ClickHouse/pull/78350](https://github.com/ClickHouse/ClickHouse/pull/78350)
 
-**For wide tables (many columns):**
-- `enable_vertical_final=1` (default) reads only needed columns in parallel
-- Ensure `max_final_threads` is not set to 1
 
-**For partitioned tables:**
-- Use `do_not_merge_across_partitions_select_final=1` when partitions are pre-optimized
-- Since 26.2, `enable_automatic_decision_for_merging_across_partitions_for_final=1` (default) auto-enables this when partition key columns are included in PRIMARY KEY
+### Settings reference
 
-**For tables with skip indexes:**
-- Both `use_skip_indexes_if_final` and `use_skip_indexes_if_final_exact_mode` are enabled by default since 25.6
-- Skip indexes on PRIMARY KEY columns have lower overhead (no extra rescan needed since 26.1), see [https://github.com/ClickHouse/ClickHouse/pull/78350](https://github.com/ClickHouse/ClickHouse/pull/78350)
+| Setting | Default | Since | Description |
+|---------|---------|-------|-------------|
+| `do_not_merge_across_partitions_select_final` | 0 | 20.10 | Skip cross-partition merging when partitions are pre-optimized |
+| `max_final_threads` | 0 (auto) | 20.5 | Thread limit for FINAL processing |
+| `enable_vertical_final` | 1 | 24.1 | Read columns in parallel from different parts |
+| `use_skip_indexes_if_final` | 1 | 25.6 | Allow skip indexes with FINAL |
+| `use_skip_indexes_if_final_exact_mode` | 1 | 25.6 | Rescan newer parts to ensure correctness with skip indexes |
+| `apply_prewhere_after_final` | 0 | 25.12 | Apply PREWHERE after deduplication (needed when PREWHERE references non-PK columns) |
+| `enable_automatic_decision_for_merging_across_partitions_for_final` | 1 | 26.2 | Auto-enable `do_not_merge_across_partitions_select_final` when partition key is in PK |