SQL: review security check for SQL/DML queries

Currently the security check (read/write permissions) is carried out during the query execution. It involves some extra actions (like a query registration) which can be avoided if the security check is conducted on the earlier stage of the query execution, for example right away after the parsing.

For SELECT queries only read permission should be checked.

For INSERT queries without SELECT only write permission should be checked.

For  UPDATE queries or INSERT queries with SELECT both read and write permissions should be checked.