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Fix #7783: Deadlock during index creation when parallel workers are used #8163

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Fix #7783: Deadlock during index creation when parallel workers are used #8163

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Commits on Apr 11, 2024

  1. Fix FirebirdSQL#7783: Deadlock during index creation when parallel wo… 

    …rkers are used

Deadlock is possible when index deletion and creation are performed in the same transaction and a deleted index is used by a computed field expression. Each worker attachment loads table's metadata, parses the expression and tries to get SR lock on the deleted index. They will never get it because the main thread holds EX lock and waits for worker attachments to complete. The solution is to prevent the optimizer from using deleted indexes by making an attempt to get SR lock with NO_WAIT.
    @ilya071294
    ilya071294 committed Apr 11, 2024
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