Vladimir Ozerov created IGNITE-6318:
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Summary: SQL: Make sure that QueryTypeDescriptorImpl is used in
thread-safe manner
Key: IGNITE-6318
URL: https://issues.apache.org/jira/browse/IGNITE-6318
Project: Ignite
Issue Type: Task
Components: sql
Affects Versions: 2.3
Reporter: Vladimir Ozerov
Assignee: Alexander Paschenko
Fix For: 2.3
{{QueryTypeDescriptorImpl}} is mostly immutable structure. But as we add more
and more DDL features, it becomes mutable. We need to make sure that it is
still thread-safe.
Specifically, when {{CREATE INDEX}} command was implemented, I guarded index
collection with mutex. Now we added {{ALTER TABLE}} command, and it seems that
thread-safety for columns was lost.
I propose to re-use index mutex (rename it to {{stateMux}}) and make sure that
column collections are also thread-safe. I would also propose to consider
copy-on-write approach, as these collections are returned by some methods as is.
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