[jira] [Created] (IGNITE-17765) Sql. Introduce cache for parsed statements

["Konstantin Orlov (Jira)" <ji...@apache.org>]

Konstantin Orlov created IGNITE-17765:
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             Summary: Sql. Introduce cache for parsed statements
                 Key: IGNITE-17765
                 URL: https://issues.apache.org/jira/browse/IGNITE-17765
             Project: Ignite
          Issue Type: Improvement
          Components: sql
            Reporter: Konstantin Orlov


Parsing of a SQL statement is fairly expensive operation. We could reduce query processing time by introducing a cache of statement text to parsed syntax tree.

Suggested solution is as follow: when query text is passed to a query processor, it should be parsed first, then we need to check if such statement is already in a statements cache. If it is not, then statementId (type of long, locally unique) should be assigned to the statement and pair <statementId, parsed tree> should be passed next to the query optimizer. Query optimizer, in turn, check if the query with given statementId is alredy optimized. 



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