Process streams of partition tables one by one in MultiplexInputStream

[gengliqi]

What problem does this PR solve?

Issue Number: close #8505

Problem Summary:
See #8505.

What is changed and how it works?

In the previous code, many streams of different partition tables may be processed concurrently. This PR simply fixes it by processing streams of partition tables one by one.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

create a table with 36 partitions.
Test SQL select * from employees.

mysql> explain analyze select * from employees;
+-------------------------+--------------+-----------+--------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------+---------+------+
| id                      | estRows      | actRows   | task         | access object   | execution info                                                                                                                                                                                                                                                                                                                                                                                                    | operator info                             | memory  | disk |
+-------------------------+--------------+-----------+--------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------+---------+------+
| TableReader_11          | 436207616.00 | 603979776 | root         | partition:all   | time:13.4s, loops:590554, RU:0.000000, cop_task: {num: 10160, max: 0s, min: 0s, avg: 0s, p95: 0s, copr_cache_hit_ratio: 0.00}                                                                                                                                                                                                                                                                                     | MppVersion: 1, data:ExchangeSender_10     | 7.92 MB | N/A  |
| └─ExchangeSender_10     | 436207616.00 | 603979776 | mpp[tiflash] |                 | tiflash_task:{proc max:12.9s, min:12.6s, avg: 12.7s, p80:12.9s, p95:12.9s, iters:10283, tasks:2, threads:72}                                                                                                                                                                                                                                                                                                      | ExchangeType: PassThrough                 | N/A     | N/A  |
|   └─TableFullScan_9     | 436207616.00 | 603979776 | mpp[tiflash] | table:employees | tiflash_task:{proc max:137.4ms, min:121ms, avg: 129.2ms, p80:137.4ms, p95:137.4ms, iters:10283, tasks:2, threads:72}, tiflash_scan:{dtfile:{total_scanned_packs:94981, total_skipped_packs:15416, total_scanned_rows:774644749, total_skipped_rows:125859659, total_rs_index_load_time: 0ms, total_read_time: 35296ms}, total_create_snapshot_time: 3ms, total_local_region_num: 972, total_remote_region_num: 0} | keep order:false, PartitionTableScan:true | N/A     | N/A  |
+-------------------------+--------------+-----------+--------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------+---------+------+
3 rows in set (13.45 sec)

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

Fix potential OOM when scanning many partition tables under stream model.

[gengliqi]

/run-all-tests

[windtalker]

Can you do some manual tests to show the memory usage with/without this pr?

[SeaRise]

LGTM

[gengliqi]

/run-all-tests

[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SeaRise, windtalker

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• OWNERS [SeaRise,windtalker]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-13 05:25:19.953213337 +0000 UTC m=+420210.990440264: ☑️ agreed by SeaRise.
• 2023-12-14 07:21:30.762528321 +0000 UTC m=+513581.799755248: ☑️ agreed by windtalker.

[gengliqi]

/hold

[gengliqi]

/unhold

[gengliqi]

/run-all-tests

[gengliqi]

/run-unit-test

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #8520.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #8521.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #8522.