vreplication: improved rowstreamer #5130
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For composite primary keys, mysql comes up with a full table scan for conditions like (pk1,pk2) > (1, 2). This change rewrites that condition to: (pk1 = 1 and pk2 > 2) or (pk1 > 1) Also removed the autocommit=0. It's not material to set that for obtaining read locks. Signed-off-by: Sugu Sougoumarane <[email protected]>
deepthi
reviewed
Aug 26, 2019
|
I thought about that. Was borderline on the 3-pk case. I can add a test. |
Signed-off-by: Sugu Sougoumarane <[email protected]>
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For composite primary keys, mysql comes up with a full table scan
for conditions like (pk1,pk2) > (1, 2).
This change rewrites that condition to:
(pk1 = 1 and pk2 > 2) or (pk1 > 1)
Also removed the autocommit=0. It's not material to set that for
obtaining read locks.
Signed-off-by: Sugu Sougoumarane [email protected]