tell mysql to ignore the sort index for search queries #29300
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Signed-off-by: Robin Appelman <robin@icewind.nl>
mysql really likes to pick an index for sorting if it can't fully satisfy the where filter with an index, since search queries pretty much never are fully filtered by index mysql often picks an index for sorting instead of the *much* more useful index for filtering. To bypass this, we tell mysql explicitly not to use the mtime (the default order field) index, so it will instead pick an index that is actually useful. Signed-off-by: Robin Appelman <robin@icewind.nl>
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/backport to stable22 |
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| $this->add('join', [ | ||
| $this->quoteAlias($name) => [ | ||
| // horrible query builder crimes to sneak in raw sql after the "FROM oc_filecache $name" | ||
| 'joinType' => $mysqlIndexHint . ' left', |
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what would be a clean way ? is this something that could be added upstream ?
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It would have to be added upstream (the design of the query builder doesn't really make it possible to overwrite internal parts of it) but upstream is (understandably) hesitant about adding features that only apply on one specific db backend.
While this is certainly not a nice way to do this, it is the best option I'm aware of and doesn't require waiting for upstream releases.
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This was referenced Nov 23, 2021
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Bump? What is the status? |
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replaced with #32074 |
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Involves some creative query builder usage to sneak the index hint into the query
mysql really likes to pick an index for sorting if it can't fully satisfy the where
filter with an index, since search queries pretty much never are fully filtered by index
mysql often picks an index for sorting instead of the much more useful index for filtering.
To bypass this, we tell mysql explicitly not to use the mtime (the default order field) index,
so it will instead pick an index that is actually useful.