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We strongly recommend that you take advantage of time-based partitioning. Refer to the Performance Tuning article for more information.

This UDF returns true if the unix_timestamp is equal to or later than the start_time and older than the end_time (start_time <= time && time < end_time). If end_time is omitted or NULL, the UDF assumes it’s infinite. If start_time is NULL, the UDF assumes it’s 0.