Retrieve compiled SQL query

Hello and thanks for this wonderful lib !

On my project, I use AWS S3 Select feature on CSVs stored in S3. It allows executing a SQL-like query directly on those CSVs:

import { S3Client, SelectObjectContentCommand } from '@aws-sdk/client-s3';

const s3Client = new s3Client()

const Response = await s3Client.send(
  new SelectObjectContentCommand({
    ... // some serialization options
    ExpressionType: 'SQL',
    Expression: `
      SELECT ...
      FROM S3Object
      WHERE ...
    `
  })
);

I would really like using kysely to build such queries but for the moment I cannot:

• I haven’t found a way to simply retrieve the compiled SQL query string to provide it to the S3Client
• The Kysely class constructor requires a dialect whereas I don’t really need one (other solution is to build an adapter for S3Select but that’s a whole lotta work)

Would it be possible to make dialect optional in the constructor (and throw an error if none is found when needed) and expose a compileQuery method on the db to retrieve the compiled query ?

[koskimas]

Normally you should never “hydrate” parameters to the SQL string. That’s a sure way to get your system pwned. For that reason, there’s no built in way to do it.

[igalklebanov]

Hey 👋

You can brew a dialect with existing built-in components and replace the driver with built-in DummyDriver.

This is documented in the browser example.

Now just use .compile() with any of the query builders to get CompiledQuery instances that contain sql and parameters fields.