feat(pruning): add pruning stats to EXPLAIN

[BohuTANG]

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Summary

Only works in standalone:

mysql> explain SELECT URLHash, EventDate, COUNT(*) AS PageViews FROM hits WHERE CounterID = 62 AND EventDate >= '2013-07-01' AND EventDate <= '2013-07-31' AND IsRefresh = 0 AND TraficSourceID IN (-1, 6) AND RefererHash = 3594120000172545465 GROUP BY URLHash, EventDate ORDER BY PageViews DESC LIMIT 10 OFFSET 100;
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| explain                                                                                                                                                                                                                                                                                                                                                                                      |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Limit                                                                                                                                                                                                                                                                                                                                                                                        |
| ├── limit: 10                                                                                                                                                                                                                                                                                                                                                                                |
| ├── offset: 100                                                                                                                                                                                                                                                                                                                                                                              |
| ├── estimated rows: 0.00                                                                                                                                                                                                                                                                                                                                                                     |
| └── Sort                                                                                                                                                                                                                                                                                                                                                                                     |
|     ├── sort keys: [pageviews DESC NULLS LAST]                                                                                                                                                                                                                                                                                                                                               |
|     ├── estimated rows: 0.00                                                                                                                                                                                                                                                                                                                                                                 |
|     └── EvalScalar                                                                                                                                                                                                                                                                                                                                                                           |
|         ├── expressions: [COUNT(*) (#107)]                                                                                                                                                                                                                                                                                                                                                   |
|         ├── estimated rows: 0.00                                                                                                                                                                                                                                                                                                                                                             |
|         └── AggregateFinal                                                                                                                                                                                                                                                                                                                                                                   |
|             ├── group by: [urlhash, eventdate]                                                                                                                                                                                                                                                                                                                                               |
|             ├── aggregate functions: [count()]                                                                                                                                                                                                                                                                                                                                               |
|             ├── estimated rows: 0.00                                                                                                                                                                                                                                                                                                                                                         |
|             └── AggregatePartial                                                                                                                                                                                                                                                                                                                                                             |
|                 ├── group by: [urlhash, eventdate]                                                                                                                                                                                                                                                                                                                                           |
|                 ├── aggregate functions: [count()]                                                                                                                                                                                                                                                                                                                                           |
|                 ├── estimated rows: 0.00                                                                                                                                                                                                                                                                                                                                                     |
|                 └── Filter                                                                                                                                                                                                                                                                                                                                                                   |
|                     ├── filters: [eq(hits.counterid (#6), to_int32(62_u8)), gte(hits.eventdate (#5), to_date("2013-07-01")), lte(hits.eventdate (#5), to_date("2013-07-31")), eq(hits.isrefresh (#15), to_int16(0_u8)), or(eq(hits.traficsourceid (#37), minus(1_u8)), eq(hits.traficsourceid (#37), to_int16(6_u8))), eq(hits.refererhash (#102), to_int64(3594120000172545465_u64))]       |
|                     ├── estimated rows: 0.00                                                                                                                                                                                                                                                                                                                                                 |
|                     └── TableScan                                                                                                                                                                                                                                                                                                                                                            |
|                         ├── table: default.hits.hits                                                                                                                                                                                                                                                                                                                                         |
|                         ├── read rows: 6574090                                                                                                                                                                                                                                                                                                                                               |
|                         ├── read bytes: 75603278                                                                                                                                                                                                                                                                                                                                             |
|                         ├── partitions total: 751                                                                                                                                                                                                                                                                                                                                            |
|                         ├── partitions scanned: 51                                                                                                                                                                                                                                                                                                                                           |
|                         ├── pruning stats: [segments: <range pruning: 32 to 25>, blocks: <range pruning: 589 to 51, bloom pruning: 51 to 51>]                                                                                                                                                                                                                                                |
|                         ├── push downs: [filters: [eq(hits.counterid (#6), 62_i32), gte(hits.eventdate (#5), 2013-07-01), lte(hits.eventdate (#5), 2013-07-31), eq(hits.isrefresh (#15), 0_i16), or(eq(hits.traficsourceid (#37), -1_i16), eq(hits.traficsourceid (#37), 6_i16)), eq(hits.refererhash (#102), 3594120000172545465_i64)], limit: NONE]                                        |
|                         ├── output columns: [5, 6, 15, 37, 102, 103]                                                                                                                                                                                                                                                                                                                         |
|                         └── estimated rows: 99997497.00                                                                                                                                                                                                                                                                                                                                      |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Closes #9723

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated
databend	⬜️ Ignored (Inspect)			Jan 25, 2023 at 3:12PM (UTC)