After setting distinct_attribute values inside facetStats and facetDistribution become incorrect.

[zxcq544]

Describe the bug
I am building e-commerce form. To build form I use values from facetStats and facetDistribution.
Before setting distinct_attribute eveything works correctly and I get all values for price(min and max):

{'estimatedTotalHits': 2,
 'facetDistribution': {'price': {'100': 1, '200': 1}},
 'facetStats': {'price': {'max': 200.0, 'min': 100.0}}, #important
 'hits': [{'distinct_id': 1, 'id': 0, 'price': 100},
          {'distinct_id': 1, 'id': 1, 'price': 200}],
 'limit': 20,
 'offset': 0,
 'processingTimeMs': 0,
 'query': ''}

After setting distinct_attribute my facets lose data:

{'estimatedTotalHits': 1,
 'facetDistribution': {'price': {'100': 1}},
 'facetStats': {'price': {'max': 100.0, 'min': 100.0}},  #important
 'hits': [{'distinct_id': 1, 'id': 0, 'price': 100}],
 'limit': 20,
 'offset': 0,
 'processingTimeMs': 0,
 'query': ''}

Here we can see that both min and max are same and facetDistribution shrinked to 1 value.
To Reproduce
Steps to reproduce the behavior:

1. Data that I used:

[
    {
        "id": 0,
        "price": 100,
        "distinct_id": 1
    },
    {
        "id": 1,
        "price": 200,
        "distinct_id": 1
    }
]

2. Settings that I used(in python):

client.index(index_name).update_filterable_attributes(["price"])
client.index(index_name).update_sortable_attributes(["price", ])
client.index(index_name).update_distinct_attribute("distinct_id")

Expected behavior
I expect facets to show data for all items in index even if they are using distinct_attribute. It allows to build complete user interface forms for faceted search.

Screenshots
Because of this problem my form looks like that :

But it should look like that:

Here we can see that audio speakers are grouped by nominal impedance which is distinct_attribute for them.
But because of current facet behaviour it makes impossible to build UI forms when using facets with distinct_attribute because it shrinks data to 1 item which is shown and doesn't take in consideration all of available items.

Meilisearch version:
Package version: "1.8.0"

[zxcq544]

Currently solved it by adding copy of index without distinct attribute. And that index is for facets only.

[ManyTheFish]

Hello @zxcq544,
If I understand well, your issue seems related to the following discussion:
https://github.com/orgs/meilisearch/discussions/741

We plan to solve the issue reported in the discussion by allowing the user to set the distinctAttribute at search time instead of at setting time. This would allow you to have a consistent facetDistribution using a multi-index search.

We plan to release it in 1.9.0 but it could be delayed to 1.10.0 if we encounter any issue during the implementation. 😄

[zxcq544]

Yes I have same issue. Should I close this one ?

[curquiza]

Yes, I will close it, thank you @zxcq544