I'm using the low-level datastore api and I want to query by the key
property and another property (let's call it category). So the query
filter would be: __key__ IN [k1, k2, ..., kn] and category=foo
I need to query based on a list of keys for which I'll use the IN
operator. I know that the max. number of values you can provide for
the IN clause is 30.
I have 2 questions:
1. Does the limit of 30 IN values apply to the key property as well?
2. Do I need to create a composite index on {__key__ + category} or
just on {category} for this query?
Thanks,
Keyur
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