feat(csharp/src/Drivers/Databricks): Fix for older DBR versions incorrect ResultFormat #3020
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Jun 26, 2025
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| // Process direct results first, if available | ||
| if (_statement.HasDirectResults && _statement.DirectResults?.ResultSet?.Results?.ResultLinks?.Count > 0) | ||
| if (_statement.HasDirectResults && _statement.DirectResults?.ResultSet?.Results?.ResultLinks?.Count > 0 || | ||
| (_initialResults?.Results?.ResultLinks?.Count > 0)) |
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nit: fix indentation
| /// </summary> | ||
| public sealed class DatabricksCompositeReader : TracingReader | ||
| { | ||
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nit: remove extra blank line
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| public override Schema Schema { get { return _schema; } } | ||
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nit: remove extra blank line
| /// A composite reader for Databricks that delegates to either CloudFetchReader or DatabricksReader | ||
| /// based on CloudFetch configuration and result set characteristics. | ||
| /// </summary> | ||
| public sealed class DatabricksCompositeReader : TracingReader |
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Suggested change
| public sealed class DatabricksCompositeReader : TracingReader | |
| internal sealed class DatabricksCompositeReader : TracingReader |
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This is because there is a bug on runtime-side:
This PR gets around that by directly inspecting the results. Since we do not always have DirectResults, we make an additional FetchResult call to determine whether to use
CloudFetchReaderor arrow-basedDatabricksReader. Only if the result contains links does it decide to useCloudFetchReader.This test does not pass in 11.3, 10.4 DBR until this commit.
dotnet test --filter "FullyQualifiedName~LZ4DecompressionCapabilityTest"
Remaining work:
Remaining work: need to update status polling to start earlier, ideally should be managed by new DatabricksCompositeReader