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christianeu-db merged 1 commit into from
Oct 29, 2026
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docs(core-spec): correct Sigma CASE and NULLIF mappings #660

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4 changes: 2 additions & 2 deletions core-spec/expression_language.md
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Expand Up @@ -813,10 +813,10 @@ date range. For a row-level shift, add a number of days to the date directly, or

| Ossie Standard | Tableau | Looker Studio | DAX | Sigma |
| :---- | :---- | :---- | :---- | :---- |
| `CASE WHEN...` | `CASE WHEN...` or `IF...` | `CASE WHEN...` | `SWITCH(TRUE(), ...)` | Only 3-argument `If(cond, t, f)`; no native multi-branch `CASE` |
| `CASE WHEN...` | `CASE WHEN...` or `IF...` | `CASE WHEN...` | `SWITCH(TRUE(), ...)` | `If(c1, v1, c2, v2, ..., else)` (variadic; else is optional and defaults to Null) |
| `IF(cond, t, f)` | `IF cond THEN t ELSE f END` | N/A (use CASE) | `IF(cond, t, f)` | `If(cond, t, f)` |
| `COALESCE(a, b)` | `IFNULL(a, b)` or `ZN(a)` | `COALESCE(...)` | `COALESCE(a, b)` | `IfNull(a, b)` (2-argument only) |
| `NULLIF(a, b)` | `IF a = b THEN NULL ELSE a END` | N/A | `IF(a = b, BLANK(), a)` | `If(a = b, Null(), a)` |
| `NULLIF(a, b)` | `IF a = b THEN NULL ELSE a END` | N/A | `IF(a = b, BLANK(), a)` | `NullIf(a, b)` |

### Window Function Mapping

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