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This implements `DB_Column.with`, which uses `WITH ... AS` SQL clauses to remove duplicates in the generated SQL. After a discussion with @radeusgd, we concluded that we will probably want a more complete CTE implementation, so this one is useful for now to deal with big queries (like `round`). # Important Notes Still to do in this PR: - [x] Rename `with` to `let` (or something similar) - [x] tests - [x] documentation - [x] remove `State` hack by moving query generation into a class and using a `Ref` field for scoping Results on `round_float`: | --- | SQL length in characters (unprettified) | SQL length in lines (prettified) | | --- | --- | --- | | Without CTEs | 13193 | 851 | | With CTEs | 3644 | 187 | Compare the SQL: [without-ctes.sql.txt](https://github.com/user-attachments/files/16629356/without-ctes.sql.txt) [with-ctes.sql.txt](https://github.com/user-attachments/files/16629357/with-ctes.sql.txt) Update, with name shortening: | --- | SQL length in characters (unprettified) | SQL length in lines (prettified) | | --- | --- | --- | | Without CTEs | 13193 | 853 | | With CTEs | 2427 | 176 | [without-cte.txt](https://github.com/user-attachments/files/16694328/without-cte.txt) [with-cte.txt](https://github.com/user-attachments/files/16694327/with-cte.txt) |
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This is a set of tests for the Snowflake integration for Enso.
Testing Snowflake
To run the tests, you need to prepare credentials for a Snowflake instance that can be used to run them on.
Please set the following environment variables:
ENSO_SNOWFLAKE_ACCOUNT- the account name for the Snowflake instance,ENSO_SNOWFLAKE_USER- the username to use for the tests,ENSO_SNOWFLAKE_PASSWORD- the password for the user, for security reasons this can be a plain text value or an Enso Secret. If using a secret, please provide it as path -enso://orgid/path/foo.secret,ENSO_SNOWFLAKE_DATABASE- the name of the database to use for the tests,ENSO_SNOWFLAKE_SCHEMA- the name of the schema to use for the tests, (optional, defaults toPUBLIC),ENSO_SNOWFLAKE_WAREHOUSE- the name of the warehouse to use for the tests (optional, defaults to blank value).