Do not merge until v8.5.4: doc updates for v8.5.4#21061

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qiancai wants to merge 13 commits intorelease-8.5from

feature/preview-v8.5.4

Commits on Nov 10, 2025

Do not merge until v8.5.4: MySQL compatibility about decimal insert through jdbc (#21046)
ChangRui-Ryan
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Merge branch 'release-8.5' into feature/preview-v8.5.4
qiancai
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Add docs for Analyze Embedded in DDL and new system variable (#21031) (#21060)
ti-chi-bot
authored
planner: Add subquery variables (#21032) (#21056)
ti-chi-bot
authored
v8.5.4: tiflash: add a config named `graceful_shutdown_wait_timeout` (#20894) (#21048)
ti-chi-bot
authored
v8.5.4: partitioned-table: global index supports non-unique index (#19507) (#20982)
ti-chi-bot
authored
v8.5.4: distribute-table: support to scatter the region distribution of the given table and engine (#19534) (#20985)
ti-chi-bot
authored
v8.5.4: tidb: change the default value of `tidb_mpp_store_fail_ttl` (#20668) (#21047)
ti-chi-bot
authored

Commits on Nov 12, 2025

v8.5.4: reference: update doc for follower read (#20703) (#21041)

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Commits on Nov 18, 2025

Commits on Nov 19, 2025