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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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| .. | ||
| AWS_Tests | ||
| Base_Internal_Tests | ||
| Base_Tests | ||
| Benchmarks | ||
| Examples_Tests | ||
| Exploratory_Benchmarks | ||
| Geo_Tests | ||
| Google_Api_Test | ||
| Helpers | ||
| Image_Tests | ||
| micro-distribution | ||
| Microsoft_Tests | ||
| Snowflake_Tests | ||
| Table_Tests | ||
| Tableau_Tests | ||
| Visualization_Tests | ||