v.19.4Performance Improvements

When Min_bytes_to_use_direct_io Is Set to 1, Not Every File Was Opened with O_direct Mode Because the Data Size to Read Was Sometimes Underestimated by the Size of One Compressed Block

Official CH changelog text
When min_bytes_to_use_direct_io is set to 1, not every file was opened with O_DIRECT mode because the data size to read was sometimes underestimated by the size of one compressed block. #4526 (alexey-milovidov)
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