Aleksey Plekhanov created IGNITE-27432:
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Summary: Calcite engine. Make query plan cache size tunable
Key: IGNITE-27432
URL: https://issues.apache.org/jira/browse/IGNITE-27432
Project: Ignite
Issue Type: Improvement
Reporter: Aleksey Plekhanov
Currently we have plans cache with hardcoded (1024) size. See
\{{QueryPlanCacheImpl#CACHE_SIZE}}. This size must be tunable via dinamic
configuration.
Also, plans cache used for two different purposes:
* Cache for query -> plan (to avoid planning)
* Cache for json -> fragment (to avoid deserialization)
This has the following disadvantages.
* User can't rely on common CACHE_SIZE variable to know how many user queries
can fit the cache, since some of the slots are occupied by fragments.
* Plans cache is cleared on DDL, but fragments cache should not.
* Plans cache requires query properties, such as schema, parameter types, etc,
but fragments cache only requires json text.
* For fragments cache we can return FragmentPlan, not QueryPlan, to avoid
additional checks and casts (Map<String, FragmentPlan> type can be used).
We should use different data structures for these caches.
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