REOPT once: query optimization occurs once at query execution time, when the query is executed for the first time.
REOPT ONCE：查询执行中只发生一次查询优化，即在查询第一次执行时。
REOPT once: query optimization occurs once at query execution time, when the query is executed for the first time.
REOPT ONCE：查询执行中只发生一次查询优化，即在查询第一次执行时。
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