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FEATURE: Make emotion /filter ordering match the dashboard table #939
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This change makes the /filter endpoint use the same criteria we use in the dashboard table for emotion, so it is not confusing for users. It means that only posts made in the period with the emotion shall be shown in the /filter, and the order is simply a count of posts that match the emotion in the period. It also uses a trick to extract the filter period, and apply it to the CTE clause that calculates post emotion count on the period, making it a bit more efficient. Downside is that /filter filters are evaluated from left to right, so it will only get the speed-up if the emotion order is last. As we do this on the dashboard table, it should cover most uses of the ordering, kicking the need for materialized views down the road.
pmusaraj
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Nov 21, 2024
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pmusaraj
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Looks good to me, CI test failures look relevant, though.
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This change makes the /filter endpoint use the same criteria we use
in the dashboard table for emotion, so it is not confusing for users.
It means that only posts made in the period with the emotion shall be
shown in the /filter, and the order is simply a count of posts that
match the emotion in the period.
It also uses a trick to extract the filter period, and apply it to
the CTE clause that calculates post emotion count on the period, making
it a bit more efficient. Downside is that /filter filters are evaluated
from left to right, so it will only get the speed-up if the emotion
order is last. As we do this on the dashboard table, it should cover
most uses of the ordering, kicking the need for materialized views
down the road.