Performance issue with large-ish nested query

Hasura version: v1.0.0-alpha23

I have a 40k row table I’m joining to a 5.5m row table. Querying with Hasura is exceptionally slow, but Postgres isn’t.

The GraphQL query looks like this:

{
   blocksummary_total (limit: 10){
    total_payments
    amount_due
    blockYearly {
      year
      violation_code
      violation_description
    }
  }
}

I’ve limited it to 10 results because much more than that and Hasura just hangs for so long I’m forced to give up. Running with a limit of 10 takes between 10-20seconds. Here’s an example log line for this query:

{"timestamp":"2018-10-11T15:07:54.667+0000","level":"info","type":"http-log","detail":{"status":200,"query_hash":"476106a5c31616b2b50f3e59cfb2d6874135ce56","http_version":"HTTP/1.1","query_execution_time":13.5884354,"request_id":null,"url":"/v1alpha1/graphql","hasura_metadata":null,"ip":"172.17.0.1","response_size":592159,"method":"POST","hasura_role":null,"detail":null}}

What I believe is the equivalent SQL-native query (forgive my ignorance for not yet having figured out how to access the query Hasura is constructing):

explain analyze select
	t.geocoded_address,
	t.total_payments,
	t.amount_due,
	y.year,
	y.violation_code,
	y.violation_description
from blocksummary_total t
join blocksummary_yearly y
	on t.geocoded_address = y.geocoded_address
limit 10;

The query plan and actual execution for this query:

  ->  Nested Loop  (cost=0.41..2553486.26 rows=5510465 width=105) (actual time=0.353..0.849 rows=10 loops=1)
        ->  Seq Scan on blocksummary_yearly y  (cost=0.00..166756.65 rows=5510465 width=90) (actual time=0.011..0.012 rows=10 loops=1)
        ->  Index Scan using blocksummary_total_pk on blocksummary_total t  (cost=0.41..0.43 rows=1 width=57) (actual time=0.082..0.082 rows=1 loops=10)
              Index Cond: ((geocoded_address)::text = (y.geocoded_address)::text)
Planning time: 3.180 ms
Execution time: 1.417 ms

The same query on the full dataset in Postgres takes about 5 seconds. I haven’t been able to get it to work at all in Hasura.

Am I doing something wrong? Did I find a bug?

Use case: I’m using Hasura with GatsbyJS to generate tens of thousands of pages for a news application about parking tickets in Chicago.

[0x777]

Is it possible for you to add an index on geocoded_address column of blocksummary_yearly?

create index on blocksummary_yearly (geocoded_address);

[coco98]

@eads Hang tight. @0x777 will look into this and get back to you asap.

We’re also adding a “View SQL” button on the console to make getting the SQL easier 😃