DM-53046: Experiments with speeding up the ANTL4-based query parser of Qserv#973
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DM-53046: Experiments with speeding up the ANTL4-based query parser of Qserv#973iagaponenko wants to merge 5 commits intomainfrom
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An assumption is that multi-threading reinforcement made to CssAccess no longer requires the additional locking.
Added infrequent logging for performance studies of the query parsing.
Lexer is still the same. Eliminated unsupported queries in the unit tests.
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