rusackas commented on issue #36304:
URL: https://github.com/apache/superset/issues/36304#issuecomment-4774494300

   Digging in a bit more, I don't think the empty/partial joins are a 
one-filter-per-column thing like the bot suggested. It's 
`SUPERSET_META_DB_LIMIT` (default 1000) getting applied to each underlying 
table *before* the in-memory join runs, so if either side of the join has more 
rows than the limit, matching rows get silently truncated and the join comes 
back incomplete or empty. As a workaround you can raise 
`SUPERSET_META_DB_LIMIT` above your largest joined table, or set it to `None` 
if your tables are small. I opened #41302 to document the caveat, and we can 
leave this open for the deeper discussion on whether the truncation behavior 
itself should change.
   


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