I suspect I've hit a problem where korma and h2 don't like each other. 
Korma likes to group "join" clauses with parentheses (via 
korma.sql.utils/left-assoc), but the parentheses appear to prevent h2 from 
picking appropriate indexes, so the performance is unusable. Removing the 
parentheses fixes the query.

I'm not very excited about manipulating raw sql strings, or patching & 
rebuilding korma for this case.

Are there any good ways to work around this? Or good alternatives to korma?

If there are no good options, can I monkey patch it? And if so, how would I 
do that? I.e. can I replace a function in korma.sql.engine such that when I 
invoke korma it will use the new function?

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