I believe I understand the problem now.
1) ES applies operators immediately to the left and right operand
2) ES does not virtually parenthesize groups after evaluating a higher
precedence operator
Thus, with a default operator of AND.
Z B C OR D E F is interpreted as +Z + B C D +E +F
My expectation would have been interpreted as Z AND B AND C OR D AND E AND
F to evalulate to (+Z + B +C) OR (+D +E + F)
Does ES intend to fix this to more match the latter expectation? It seems
the only mitigation right now would be to:
(Z B C) OR (D E F)
On Friday, May 9, 2014 10:21:49 AM UTC-7, Erich Lin wrote:
>
> Thank you Binh. That validate API with explain is quite helpful. The
> feature seems a bit confusing because the API for query_string states that
> the precedence order of logical operators follow:
> AND first, then OR.
>
> Thus, when I see 'sofa OR rugs AND red', my brain would translate that
> into
> 1) Do the highest precedence operator : AND -> sofa OR (rugs AND red)
>
> Could you explain why this would be a feature and how it does not conflict
> with the API's definition of precedence?
>
> Erich
>
>
> On Friday, May 9, 2014 7:18:02 AM UTC-7, Binh Ly wrote:
>>
>> It's a "feature" of the query_string. What's happening is this query:
>>
>> sofa OR rugs AND red
>>
>> Actually means "rugs" and "red" must be there (always) to match. And if a
>> document is a match (i.e. it contains both rugs and red) and it contains
>> sofa also, then boost that document up some more ahead of the others.
>>
>> This query:
>>
>> sofa OR (rugs AND red)
>>
>>
>> Actually means either "sofa" is there, or ("rugs" and "red") is there to be
>> a match. This is what you expect as normal boolean logic.
>>
>>
>> The easiest way to see and understand whats happening is to use the
>> _validate API like this:
>>
>>
>> curl -XPOST "http://localhost:9200/f/_validate/query?explain&pretty"; -d '
>>
>> {
>> "query": {
>> "query_string": {
>> "query": "sofa OR rugs AND red",
>> "default_operator": "AND"
>> }
>> }
>> }'
>>
>>
>> If you _validate/explain the other query, you will understand how it is
>> "interpreted".
>>
>>
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