AfterShip / clickhouse-sql-parser / 30622883665

Build # 30622883665

Build Type

Pull #296

github

Committed by therealpandey

Commit Message

Memoize failed INTERVAL operator attempts to avoid exponential backtracking

A failed attempt reparses the whole remaining expression, and every
later interval inside that attempt does the same, so queries with
repeated interval columns backtracked exponentially. The outcome at a
position is deterministic, so record failed positions and fall back to
the identifier reading immediately on a repeat.

Pull Request Pull Request #296: Fix parsing of an unquoted interval as a column name

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