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* Consolidate a bunch of ad-hoc segments metadata SQL; fix some bugs. This patch gathers together a variety of SQL from SqlSegmentsMetadataManager and IndexerSQLMetadataStorageCoordinator into a new class SqlSegmentsMetadataQuery. It focuses on SQL related to retrieving segment payloads and marking segments used and unused. In addition to cleaning up the code a bit, this patch also fixes a bug with years before 0 or after 9999. The prior SQL did not work properly because dates outside this range cannot be compared as strings. The new code does work for these far-past and far-future years. So, if you're ever interested in using Druid to analyze things from ancient Babylon, you better apply this patch first! * Fix test compiling. * Fixes and improvements. * Fix forbidden API. * Additional fixes.