[jira] [Created] (IGNITE-6415) ALTER TABLE: investigate why descriptor is not updated from GridQueryProcessor#onLocalOperationFinished

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-6415:
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             Summary: ALTER TABLE: investigate why descriptor is not updated from GridQueryProcessor#onLocalOperationFinished
                 Key: IGNITE-6415
                 URL: https://issues.apache.org/jira/browse/IGNITE-6415
             Project: Ignite
          Issue Type: Task
          Components: sql
    Affects Versions: 2.3
            Reporter: Vladimir Ozerov
            Assignee: Alexander Paschenko
             Fix For: 2.3


For {{CREATE INDEX}} and {{DROP INDEX}} our DDL engine works as follows:
1) Update H2 structures from DDL worker thread
2) Then update type descriptor from {{GridQueryProcessor#onLocalOperationFinished}}

For some reason {{ALTER TABLE}} handled differently, and we first update descriptor, then update H2. See {{GridQueryProcessor#processSchemaOperationLocal}}. 

Two questions:
1) Why descriptor is updated before H2? In this case we may endup in inconsistent state if H2 failed for some reason
2) Why we decided not to follow {{CREATE/DROP INDEX}} approach?



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