## Polars

| Variable                            | Description                                                                                                                                                                                                         |
| ----------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `POLARS_ALLOW_PQ_EMPTY_STRUCT`      | Allows reading or writing Parquet files that contain empty struct fields that are otherwise rejected.                                                                                                               |
| `POLARS_SKIP_DSL_HASH_VERIFICATION` | Skips internal DSL schema/hash compatibility checks between `polars-cloud` client and `polars-on-premises` binary.<br>Set to `1` only in controlled environments when working around temporary DSL hash mismatches. |
| `POLARS_TEMP_DIR`                   | Override the default temporary directory Polars uses for scratch files and some I/O operations.                                                                                                                     |

You may also set any Polars OSS-recognized environment variables.

## Polars on-premises

| Variable                   | Description                                                                                                                                                                                                     |
| -------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `OTLP_ENDPOINT`            | Target endpoint for sending OTLP traces/metrics/logs to your OpenTelemetry collector/observability stack.<br>e.g. `http://otel-collector:4317`.                                                                 |
| `OTEL_SERVICE_INSTANCE_ID` | OpenTelemetry `service.instance.id` that uniquely identifies this cublet instance in telemetry.<br>Must match `cublet_id`.                                                                                      |
| `PLC_LOG_LEVEL`            | Controls logging verbosity for the Polars on-premises components (e.g. scheduler/worker).<br>e.g. `Info`, `Debug`, `Trace`, _etc._ (follows the Rust [naming](https://docs.rs/log/latest/log/enum.Level.html)). |


Collaborative Calculation and Data Science

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sagemath

Variable	Description
`OTLP_ENDPOINT`	Target endpoint for sending OTLP traces/metrics/logs to your OpenTelemetry collector/observability stack. e.g. `http://otel-collector:4317`.
`OTEL_SERVICE_INSTANCE_ID`	OpenTelemetry `service.instance.id` that uniquely identifies this cublet instance in telemetry. Must match `cublet_id`.
`PLC_LOG_LEVEL`	Controls logging verbosity for the Polars on-premises components (e.g. scheduler/worker). e.g. `Info`, `Debug`, `Trace`, etc. (follows the Rust naming).

Polars

Polars on-premises

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Variable	Description
`POLARS_ALLOW_PQ_EMPTY_STRUCT`	Allows reading or writing Parquet files that contain empty struct fields that are otherwise rejected.
`POLARS_SKIP_DSL_HASH_VERIFICATION`	Skips internal DSL schema/hash compatibility checks between `polars-cloud` client and `polars-on-premises` binary. Set to `1` only in controlled environments when working around temporary DSL hash mismatches.
`POLARS_TEMP_DIR`	Override the default temporary directory Polars uses for scratch files and some I/O operations.