[Yandex DataLens] Data source timed out

ERR.DS_API.DB.SOURCE_ERROR.TIMEOUT

Query execution time exceeded for the data source.

To fix this error:

• Optimize the data in the source.
• Reduce the number of complex expressions with nested aggregations.
• Reduce the number of fields in a dataset.
• Create calculated fields at the dataset level instead of fields at the chart level.