explain: add subqueries (#3948) #4192
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TomShawn
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Nov 9, 2020
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cherry-pick #3948 to release-4.0
What is changed, added or deleted? (Required)
This is a followup PR to #3858 - but they can be reviewed independently, and merge out of order.
This PR does not add this page to the TOC. I will only do that once all PRs are merged (this is one ~3-4 followup PRs).
The content here is based on/duplicates query-execution-plan. I will merge all of the replacement pages, and then update query-execution-plan (soon to be called explain-overview) as a last step, and in the same PR which adds this page to the TOC.
Note to reviewers: I would love to link
index jointo the explain-joins.md document which explains what that means. But I have not for now, since I want this PR or #3922 to be able to merge out of order. Thanks!Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?