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statistics: mark NDV as deprecated and update variable scopes (#18499) #18524

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Aug 7, 2024
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statistics: mark NDV as deprecated and update variable scopes (#18499) #18524

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This is an automated cherry-pick of #18499
Rustin170506 Aug 7, 2024
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resolve conflicts
Oreoxmt Aug 7, 2024
a576ca7
resolve conflicts
Oreoxmt Aug 7, 2024
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2 changes: 1 addition & 1 deletion statistics.md
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Expand Up @@ -654,7 +654,7 @@ Currently, the `SHOW STATS_BUCKETS` statement returns the following 11 columns:
| `repeats` | The occurrence number of the maximum value |
| `lower_bound` | The minimum value |
| `upper_bound` | The maximum value |
| `ndv` | The number of different values in the bucket. When `tidb_analyze_version` = `1`, `ndv` is always `0`, which has no actual meaning. |
| `Ndv` | The number of distinct values in the bucket. This field is deprecated and always shows `0` due to its inaccurate value. |

### Top-N information

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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1323,7 +1323,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;

### tidb_build_sampling_stats_concurrency <span class="version-mark">New in v7.5.0</span>

- Scope: GLOBAL
- Scope: SESSION | GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Integer
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