Hi, I need to query data from a set with two bins, one is string type, the other is boolean type.
Because of only one bin can be used as filter when query, I use the string-typed bin as filter, and make a filter expression to filter the boolean-typed bin.
The string typed bin has been set as secondary index. The boolean-typed is not set as secondary index now.
Could query be faster, if I set a secondary index on the boolean-typed bin?
Another question is if bin type of a sindex can be boolean-type? I check the doc said the bin type should be numeric, string or geo2dsphere.
Hi @dzhhh, welcome to the forum!
To answer your second question first, there isn’t a way to create a secondary index on a boolean-typed bin. To do something like this, your best bet would be storing the boolean as a number, like
1 | 0 and creating an index on that.
If you were able to create an index on the bin you are trying to filter, that would be faster than a filter and filter expression like you’re working with now. Hope that helps!
Does the filter expression benefit from a secondary index?
If a filter uses a bin, will creating a secondary index on that bin make the filter query faster than before?
Currently, no - but this is planned.
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