Support for sharded tables on Azure Hyperscale (Citus)

Hi team,

We’ve run into a roadblock when testing Azure Database for PostgreSQL Hyperscale (i.e. Citus) with Hasura. Is this a known issue / limitation, or something that we’ve missed?

Originally we were looking into Yugabyte, which is probably great for some use cases, but it wasn’t coping well with our large and rather complex schema. Citus offers a Microsoft-backed PaaS solution that would be ideal for us.

Example error:

{
  "errors": [
    {
      "extensions": {
        "internal": {
          "statement": "SELECT  coalesce(json_agg(\"root\" ), '[]' ) AS \"root\" FROM  (SELECT  row_to_json((SELECT  \"_1_e\"  FROM  (SELECT  \"_0_root.base\".\"connector_uuid\" AS \"connector_uuid\", \"_0_root.base\".\"batch_uuid\" AS \"batch_uuid\", \"_0_root.base\".\"ext_id\" AS \"ext_id\", \"_0_root.base\".\"landed_file\" AS \"landed_file\", \"_0_root.base\".\"last_updated\" AS \"last_updated\", \"_0_root.base\".\"last_updated_src\" AS \"last_updated_src\", \"_0_root.base\".\"lkey\" AS \"lkey\"       ) AS \"_1_e\"      ) ) AS \"root\" FROM  (SELECT  *  FROM \"etl\".\"keystore\"  WHERE ('true')     ) AS \"_0_root.base\"      ) AS \"_2_root\"      ",
          "prepared": true,
          "error": {
            "exec_status": "FatalError",
            "hint": "Consider using an equality filter on the distributed table's partition column.",
            "message": "could not run distributed query with subquery outside the FROM, WHERE and HAVING clauses",
            "status_code": "0A000",
            "description": null
          },
          "arguments": [
            "(Oid 114,Just (\"{\\\"x-hasura-role\\\":\\\"admin\\\"}\",Binary))"
          ]
        },
        "path": "$",
        "code": "unexpected"
      },
      "message": "database query error"
    }
  ]
}

[dave-philp]

Hi @tirumaraiselvan. Checking in again to see if there’s been any updates on this one.

Although, we do not yet have Citus support officially (coming very soon), Hasura may still start and work for basic queries on Citus (it may also not work for other basic queries).

Is there an ETA for Citus support, even if its alpha or beta? 🙂

[Ciboulette]

I’m also interested to know when this feature would be available 😇