"if an extraneous "db.item.id>0" impacts the query performance at all?"
depending on the system it definitely does for sufficiently complex
queries. on GAE, probably no effect, on oracle,mysql, postgres it depends
on how you setup your indexes - you can probably write indexes so it has
close t
I like the "query &= fragment" approach better but am not sure how or if you
can set up the default. Does anyone know if an extraneous "db.item.id>0"
impacts the query performance at all?
how about use bruno's suggestion, but leave out the default at the top. if
the list of queries is empty when you get to the reduce step then set
query=(db.table.id>0) otherwise do the reduce?
A couple other notes:
- I know I could start with a query that will return everything, like
"db.person.id > 0", but I'm worried about how that will interact with
queries that are optimized by an index that doesn't include the id
column
- An old trick when building up SQL WHERE statements as strin
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