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docs(nosql): document LOG/LOG10 zero-argument limitation (#310) #3149

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15 changes: 13 additions & 2 deletions packages/nosql-language-service/docs/test-suite.md
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Original file line number Diff line number Diff line change
Expand Up @@ -94,8 +94,6 @@ Some fixtures are marked with `knownLimitation` in their definition. These tests
| ID | Query feature | Reason |
| ------ | ------------------ | ------------------------------------------------------------------- |
| STR-12 | `TRIM()` | Not implemented in vnext-preview |
| M-07 | `LOG(0)` | Produces `-Infinity` → JSON error 4001 |
| M-13 | `LOG10(0)` | Produces `-Infinity` → JSON error 4001 |
| SQ-02 | `FIRST()` subquery | Not supported in vnext-preview |
| UDF-01 | UDF in SELECT | "Server-side scripts are not supported in this emulator" (HTTP 400) |
| UDF-02 | UDF in WHERE | "Server-side scripts are not supported in this emulator" (HTTP 400) |
Expand All @@ -107,6 +105,19 @@ When Microsoft ships a stable Linux emulator that supports these features, remov

---

## Cosmos DB language limitations (not emulator-specific)

These fixtures fail on **both production Azure Cosmos DB and the emulator**. The parser accepts the query, but the service rejects it at execution time. These are not emulator gaps — do **not** remove the `knownLimitation` when the emulator stabilizes.

| ID | Query feature | Reason |
| ---- | ------------- | --------------------------------------------------------------------------------------------------------------------------- |
| M-07 | `LOG(0)` | `LOG(0)` / negative argument → `-Infinity`, which is not valid JSON. Service returns HTTP 400 error 4001. See issue #310. |
| M-13 | `LOG10(0)` | `LOG10(0)` / negative argument → `-Infinity`, which is not valid JSON. Service returns HTTP 400 error 4001. See issue #310. |

> **Workaround:** guard the argument so it is always greater than 0, e.g. `WHERE c.value > 0` or `c.value > 0 ? LOG(c.value) : null`. This is data-dependent (only rows with a 0/negative value fail), so no static diagnostic is emitted — see the LOG/LOG10 hover documentation for details.

---

## Seed data

| Container | Documents | Size |
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4 changes: 4 additions & 0 deletions packages/nosql-language-service/src/docs/index.ts
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Expand Up @@ -1842,6 +1842,8 @@ Returns the natural logarithm of the specified numeric expression, or the logari

Returns a numeric value.

> ⚠️ **The argument must be greater than 0.** \`LOG(0)\` (or a negative value) evaluates to \`-Infinity\`, which is not representable in JSON. Azure Cosmos DB rejects such a result with **HTTP 400, error code 4001** (both on production and the emulator). Guard the input, e.g. \`WHERE c.value > 0\` or \`c.value > 0 ? LOG(c.value) : null\`.

---

📖 **Documentation:** [LOG](https://learn.microsoft.com/en-us/cosmos-db/query/log)`],
Expand All @@ -1862,6 +1864,8 @@ Returns the base-10 logarithm of the specified numeric expression.

Returns a numeric value.

> ⚠️ **The argument must be greater than 0.** \`LOG10(0)\` (or a negative value) evaluates to \`-Infinity\`, which is not representable in JSON. Azure Cosmos DB rejects such a result with **HTTP 400, error code 4001** (both on production and the emulator). Guard the input, e.g. \`WHERE c.value > 0\` or \`c.value > 0 ? LOG10(c.value) : null\`.

---

📖 **Documentation:** [LOG10](https://learn.microsoft.com/en-us/cosmos-db/query/log10)`],
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6 changes: 4 additions & 2 deletions packages/nosql-language-service/src/test-fixtures/queries/select-functions.ts
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Expand Up @@ -179,7 +179,8 @@ export const fixtures: QueryFixture[] = [
query: 'SELECT LOG(c.price) FROM c',
container: 'products',
expectAst: fn('LOG'),
knownLimitation: 'LOG(0) produces -Infinity which is not valid JSON (error 4001 in vnext-preview)',
knownLimitation:
'LOG(0) (or a negative argument) produces -Infinity, which is not valid JSON. Azure Cosmos DB rejects it with HTTP 400 error 4001 on both production and the emulator.',
},
{
id: 'M-08',
Expand Down Expand Up @@ -527,7 +528,8 @@ export const fixtures: QueryFixture[] = [
query: 'SELECT LOG10(c.price) FROM c',
container: 'products',
expectAst: fn('LOG10'),
knownLimitation: 'LOG10(0) produces -Infinity which is not valid JSON (error 4001 in vnext-preview)',
knownLimitation:
'LOG10(0) (or a negative argument) produces -Infinity, which is not valid JSON. Azure Cosmos DB rejects it with HTTP 400 error 4001 on both production and the emulator.',
},
{
id: 'M-14',
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