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Stephan Perktold added a comment - 19/May/20 04:56 PM
Test to demonstrate the bug.
Thanks for reporting. I'll try and reproduce this later this week and fix it for 3.0.x and 4.0.x. It will not be fixed in 2.2.x, as 2.2.x is no longer maintained.
Fixed for 3.0.9, 4.0.1 and 5.
Before updating the row, blob fields are 'flushed'. The issue was that flushing the field would mark it as updated (to null), which would then result in the field being included in the update statement. Blob fields now track if they are explicitly updated to null, and otherwise do not flush their null state. Jaybird 3.0.9, which contains this fixed has been released today. The release of 4.0.1 is not planned yet.
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