Invalidating query cache entries Sexchat one on one person

But actually only the modified query string is saved for it which might make it possible to eventually have a shared cache.There are still a number of structures that are saved to properly set up the query (results schema, Table Access Info/Column Access Info, Read Entities), so those would have to be saved somehow.

Originally the thinking was the query plan or AST would be part of the information saved in the cache, and might have been problematic to save and share between the different instances.This can give us a chance to avoid full query optimization/planning.Access to the AST also allows Hive to fully qualify table references (to make sure the current query is using the same tables as the cached query), plus row filtering and column masking rewrites (from Ranger access rules) occur on the AST so this can still work with those.Many of the existing DBMS results caching solutions seem to cache results based on the query string.Unqualified table references need to be taken into account - depending on the current database at the time of the query, 2 queries running the exact same query string may access tables from completely different databases.

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