The max_remote_stream shown in execution info.tiflash_task is not correct

[JaySon-Huang]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

Run explain analyze ... on tiflash queries

The remote_regions and min_remote_stream is 0, but the max_remote_stream is "5818ms"

tiflash_task:{time:5.83s, loops:1152, threads:16}, tiflash_scan:{mvcc_input_rows:0, mvcc_input_bytes:0, mvcc_output_rows:0, lm_skip_rows:0, local_regions:194, remote_regions:0, tot_learner_read:14ms, region_balance:{instance_num: 1, max/min: 194/194=1.000000}, delta_rows:0, delta_bytes:0, segments:105, stale_read_regions:0, tot_build_snapshot:0ms, tot_build_bitmap:16ms, tot_build_inputstream:146ms, min_local_stream:4573ms, max_local_stream:5818ms, min_remote_stream:0ms, max_remote_stream:5818ms, dtfile:{data_scanned_rows:71997669, data_skipped_rows:0, mvcc_scanned_rows:0, mvcc_skipped_rows:0, lm_filter_scanned_rows:0, lm_filter_skipped_rows:0, tot_rs_index_check:26ms, tot_read:2873ms}}

3. What did you see instead (Required)

The max_remote_stream should be 0 when remote_regions is 0

4. What is your TiDB version? (Required)

master

[JaySon-Huang]

/label affects-8.1

[JaySon-Huang]

/label severity/moderate

[ti-chi-bot]

@JaySon-Huang: The label(s) severity/moderate cannot be applied. These labels are supported: fuzz/sqlancer, challenge-program, compatibility-breaker, first-time-contributor, contribution, good first issue, correctness, duplicate, proposal, security, ok-to-test, needs-ok-to-test, needs-more-info, needs-cherry-pick-release-5.4, needs-cherry-pick-release-6.1, needs-cherry-pick-release-6.5, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.5, needs-cherry-pick-release-8.1, affects-5.4, affects-6.1, affects-6.5, affects-7.1, affects-7.5, affects-8.1, may-affects-5.4, may-affects-6.1, may-affects-6.5, may-affects-7.1, may-affects-7.5, may-affects-8.1.

In response to this:

/label severity/moderate

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[JaySon-Huang]

/severity moderate