CTE with RECURSIVE and UNION ALL

[oliverpool]

Version

1.15.0

What happened?

I try to generate go code with a recursive CTE, which uses UNION ALL and it fails.

My query is quite complex, but here is a simple reproduction:

Relevant log output

query.sql:7:8: column "n" does not exist

Database schema

None

SQL queries

-- name: CTERecursive :many
WITH RECURSIVE t(n) AS (
    VALUES (1)
  UNION ALL
    SELECT n+1 FROM t WHERE n < 100
)
SELECT n FROM t;

Configuration

{
  "version": "1",
  "packages": [
    {
      "path": "go",
      "name": "querytest",
      "schema": "query.sql",
      "queries": "query.sql"
    }
  ]
}

Playground URL

https://play.sqlc.dev/p/5c0c86493af9912a8d54ab083a92edcd4105ea8baf30681e1abe761a0cce1246

What operating system are you using?

Linux

What database engines are you using?

PostgreSQL

What type of code are you generating?

Go

[oliverpool]

Note that if I replace SELECT n with SELECT sum(n) everything works 🤔

-- name: CTERecursive :many
WITH RECURSIVE t(n) AS (
    VALUES (1)
  UNION ALL
    SELECT n+1 FROM t WHERE n < 100
)
SELECT sum(n) FROM t;

https://play.sqlc.dev/p/5c0380fceda01ba464e7e65219c9c5bb7b35e8047793a6b01d97aced8e2e21bd

[oliverpool]

I have a branch of sqlc with this exact test case. I can open a PR (however I have no idea where to look to fix this).

[oliverpool]

@kyleconroy is there anything I can do to help debug/fix this issue ? (I know go, but don't know where to start debugging such an issue)

[kyleconroy]

This is fixed in v1.23.0 by enabling the database-backed query analyzer. You can play around with the working example on the playground