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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