javascript - How to perform sql "LIKE" operation on firebase?

I am using firebase for data storage. The data structure
is like
this:

products:{

            product1:{
 name:"chocolate",
 }
 product2:{

            name:"chochocho",

            }
}

I
want to perform an auto complete operation for this data, and normally i write the query
like this:

"select name from
            PRODUCTS where productname LIKE '%" + keyword +
            "%'";

So, for my
situation, for example, if user types "cho", i need to bring both "chocolate" and
"chochocho" as result. I thought about bringing all data under "products" block, and
then do the query at the client, but this may need a lot of memory for a big database.
So, how can i perform sql LIKE
operation?

Thanks