generate ignoring IF NOT EXISTS on ADD COLUMN

[meeech]

Version

1.13.0

What happened?

Hi. New user, evaluating sqlc for use.

What Happens:

We have some migrations/*.sql. When running sqlc generate, all the .sql in this folder are being executed.

So i get errors like

migrations/V20220422073404__create_intitial_tables.sql:1:1: relation "integrations" already exists

and

migrations/V20220524081832__created_and_updated_at.sql:1:1: column "created_at" of relation "integrations" already exists

Which is fair, so I'm working to make these statements idempotent.

So in the first case (create_initial_tables.sql), I modify the SQL to use IF NOT EXISTS

CREATE table IF NOT EXISTS integrations ...

run sqlc generate and the error for that migration is resolved.

I try the same on for my 2nd sql where we are altering the table:

ALTER TABLE ONLY integrations ADD COLUMN IF NOT EXISTS created_at TIMESTAMP;

But I continue to the same error. Running this query directly with my sql tool generates no error.

Expectation:

I expect the ALTER TABLE ONLY integrations ADD COLUMN IF NOT EXISTS created_at TIMESTAMP; to respect the IF NOT EXISTS, and not give me an error on generate, similar to the CREATE table statement.

Questions:

1. Is this a bug?
2. If no, should I be doing something different to work around this issue?
3. If yes, if you can point me to the relevant area, I can look to put together a PR. No promises though, pretty new to go at this point :D

Let me know if there are any other details I can provide.

thanks for your time

Relevant log output

No response

Database schema

No response

SQL queries

ALTER TABLE ONLY public.integrations ADD COLUMN IF NOT EXISTS created_at TIMESTAMP;

Configuration

version: "1"
project:
  id: "rt"
packages:
  - path: "internal/db"
    queries: "./queries"
    schema:
      - "./schema.sql"
      - "./migrations"
    engine: "postgresql"

Playground URL

No response

What operating system are you using?

macOS

What database engines are you using?

PostgreSQL

What type of code are you generating?

Go

[SpikeWong]

/assign

[SpikeWong]

@kyleconroy
I want to make sure that what I need to do is to check the current value of stmt.IfNotExist in the addColumn method,
If a column exists and stmt.IfNotExist is true, I'll just return nil, is that right?
https://github.com/kyleconroy/sqlc/blob/b0d6f13646d52287a6eb9be623f827227bfd6c7b/internal/sql/catalog/table.go#L34