c19bb57730
Summary: Ref T7149. Return a real iterator from the Chunk engine, which processes chunks sequentially. Test Plan: This is a bit hard to read, but shows the underlying chunks being accessed one at a time and only some being accessed when requesting a range of a file: ``` $ ./bin/files cat F878 --trace --begin 100 --end 256 ... >>> [10] <query> SELECT * FROM `file_storageblob` WHERE `id` = 85 <<< [10] <query> 240 us better software. Phabricat>>> [11] <query> SELECT * FROM `file_storageblob` WHERE `id` = 84 <<< [11] <query> 205 us or includes applications for: >>> [12] <query> SELECT * FROM `file_storageblob` WHERE `id` = 83 <<< [12] <query> 226 us - reviewing and auditing source>>> [13] <query> SELECT * FROM `file_storageblob` WHERE `id` = 82 <<< [13] <query> 203 us code; - hosting and browsing >>> [14] <query> SELECT * FROM `file_storageblob` WHERE `id` = 81 <<< [14] <query> 231 us repositories; - tracking bugs; ``` Reviewers: btrahan Reviewed By: btrahan Subscribers: joshuaspence, epriestley Maniphest Tasks: T7149 Differential Revision: https://secure.phabricator.com/D12073
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