system-variables: improve noop functions warning (#6374) #6421
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Co-authored-by: TomShawn <[email protected]>
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This is an automated cherry-pick of #6374
What is changed, added or deleted? (Required)
The feature 'noop functions' is actually very unsafe. Several internal users I have spoken to recently have misunderstood it.
This changes it from a 'note' to a 'warning' and provides an example for more context of what it does.
The example will need to be changed slightly for TiDB 5.1 and below because transaction read only is not affected by noop funcs yet.
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