Storages: Add statistical data of TableScanning in ScanContext (release-7.5)

[JaySon-Huang]

cherry-pick #8676, #8842 to release-7.5

---

What problem does this PR solve?

Issue Number: ref #8675

Related tidb PR: pingcap/tidb#52338

What is changed and how it works?

• Add more statistical data of TableScanning in ScanContext.
• To distinguish between different stages of scanning files, set a ReadTag when creating DMFileReader.
• An example:

mysql> explain analyze select max(ol_o_id) from order_line where ol_dist_info < '0Fvf5TLWcqdvYC2IeTcQjgMs';
+--------------------------------+------------+---------+--------------+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------+-----------+------+
| id                             | estRows    | actRows | task         | access object    | execution info                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | operator info                                                                                     | memory    | disk |
+--------------------------------+------------+---------+--------------+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------+-----------+------+
| StreamAgg_10                   | 1.00       | 1       | root         |                  | time:772.7ms, loops:2, RU:455322.194336                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | funcs:max(tpcc.order_line.ol_o_id)->Column#12                                                     | 1.02 KB   | N/A  |
| └─TopN_13                      | 1.00       | 1       | root         |                  | time:772.7ms, loops:2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | tpcc.order_line.ol_o_id:desc, offset:0, count:1                                                   | 304 Bytes | N/A  |
|   └─TableReader_25             | 1.00       | 144     | root         |                  | time:772.7ms, loops:3, cop_task: {num: 146, max: 0s, min: 0s, avg: 0s, p95: 0s, copr_cache_hit_ratio: 0.00}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | MppVersion: 2, data:ExchangeSender_24                                                             | 571 Bytes | N/A  |
|     └─ExchangeSender_24        | 1.00       | 144     | mpp[tiflash] |                  | tiflash_task:{proc max:770.1ms, min:703.5ms, avg: 736.8ms, p80:770.1ms, p95:770.1ms, iters:144, tasks:2, threads:144}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | ExchangeType: PassThrough                                                                         | N/A       | N/A  |
|       └─TopN_23                | 1.00       | 144     | mpp[tiflash] |                  | tiflash_task:{proc max:769.1ms, min:702.5ms, avg: 735.8ms, p80:769.1ms, p95:769.1ms, iters:144, tasks:2, threads:144}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | tpcc.order_line.ol_o_id:desc, offset:0, count:1                                                   | N/A       | N/A  |
|         └─TableFullScan_21     | 5259869.34 | 2488186 | mpp[tiflash] | table:order_line | tiflash_task:{proc max:769.1ms, min:702.5ms, avg: 735.8ms, p80:769.1ms, p95:769.1ms, iters:9075, tasks:2, threads:144}, tiflash_scan:{dtfile:{data_scanned_rows:600039322, data_skipped_rows:1355266, mvcc_scanned_rows:551821000, mvcc_skipped_rows:1015522, lm_filter_scanned_rows:601394701, lm_filter_skipped_rows:0, rs_index_check_time: 21ms, read_time: 43143ms, disagg_cache_hit_size: 0, disagg_cache_miss_size: 0}, delta_rows: 259517, delta_bytes: 24654115, mvcc_input_rows: 539026105, mvcc_input_bytes: 9163443785, mvcc_output_rows: 539026105, lm_skip_rows: 1355379, segment_num: 775, create_snapshot_time: 2ms, build_bitmap_time: 44912ms, build_inputstream_time: 54915ms, local_min_stream_cost: 686ms, local_max_stream_cost: 760ms, remote_min_stream_cost: 0ms, remote_max_stream_cost: 0ms, local_region_num: 776, remote_region_num: 0, stale_read_num: 0, learner_read_time: 10ms, region_balance_info: {instance_num: 2, max/min: 396/380=1.042105}} | pushed down filter:lt(tpcc.order_line.ol_dist_info, "0Fvf5TLWcqdvYC2IeTcQjgMs"), keep order:false | N/A       | N/A  |
+--------------------------------+------------+---------+--------------+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------+-----------+------+
6 rows in set (0.78 sec)

tiflash_scan:{
	dtfile:{
		data_scanned_rows:600039322, 
		data_skipped_rows:1355266, 
		mvcc_scanned_rows:551821000, 
		mvcc_skipped_rows:1015522, 
		lm_filter_scanned_rows:601394701, 
		lm_filter_skipped_rows:0, 
		rs_index_check_time: 21ms, 
		read_time: 43143ms, 
		disagg_cache_hit_size: 0, 
		disagg_cache_miss_size: 0
	}, 
	delta_rows: 259517, 
	delta_bytes: 24654115, 
	mvcc_input_rows: 539026105, 
	mvcc_input_bytes: 9163443785, 
	mvcc_output_rows: 539026105, 
	lm_skip_rows: 1355379, 
	segment_num: 775, 
	create_snapshot_time: 2ms, 
	build_bitmap_time: 44912ms, 
	build_inputstream_time: 54915ms, 
	local_min_stream_cost: 686ms, 
	local_max_stream_cost: 760ms, 
	remote_min_stream_cost: 0ms, 
	remote_max_stream_cost: 0ms, 
	local_region_num: 776, 
	remote_region_num: 0, 
	stale_read_num: 0, 
	learner_read_time: 10ms, 
	region_balance_info: {instance_num: 2, max/min: 396/380=1.042105}
}

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • Use explain analyze to check the details of TableScanning.
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Improve the details shown in `explain analyze` execution info

[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/hold wait for tipb update

[ti-chi-bot]

PR needs rebase.

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[JaySon-Huang]

/hold cancel

[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/run-all-tests

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JinheLin, Lloyd-Pottiger

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-07 10:05:52.64436157 +0000 UTC m=+956506.401497144: ☑️ agreed by Lloyd-Pottiger.
• 2024-05-08 03:37:09.475874556 +0000 UTC m=+1019583.233010113: ☑️ agreed by JinheLin.