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Commit f72efbc2 authored by Andrey Saranchin's avatar Andrey Saranchin Committed by Aleksandr Lyapunov
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core: drop constraints in two phases 

Currently, core constraints are dropped on commit. That is why
it is impossible to drop constraint and drop objects it references to
at the same transaction. Let's drop constraints in two steps - detach
them when DDL occurs, then reattach on rollback or delete on commit.

Closes #7339

NO_DOC=bugfix
parent 5419f493
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