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Fix two instances of undefined behavior in codec crate

/run-all-tests

Fix two instances of undefined behavior in codec crate

@brson merge failed.

Fix two instances of undefined behavior in codec crate

/run-all-tests

Fix two instances of undefined behavior in codec crate

@brson merge failed.

Fix two instances of undefined behavior in codec crate

/run-all-tests

Add generation to all component statuses

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syncer(dm): option for explicit auto-id-cache handling in create table DDLs

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planner: use ordered index with is null predicate

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