Update Vindex only on changes#6737
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harshit-gangal merged 8 commits intovitessio:masterfrom Sep 24, 2020
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Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
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Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
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Signed-off-by: Harshit Gangal <harshit@planetscale.com>
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Same value vindex update are avoided by checking the old and the new value. Vitess does not perform string comparisons due to collation so for vindex involving varchar, etc. are updated even if they have same new and old values.
With this change, the string comparison is sent down to mysql through owned vindex lookup query, so there is no additional hop added and the comparison is handled by mysql.
If it returns true then the vindex is not updated.