edrevo opened a new pull request #26591: [SPARK-29248][SQL] Add PhysicalWriteInfo with number of partitions URL: https://github.com/apache/spark/pull/26591 ### What changes were proposed in this pull request? When implementing a ScanBuilder, we require the implementor to provide the schema of the data and the number of partitions. However, when someone is implementing WriteBuilder we only pass them the schema, but not the number of partitions. This is an asymetrical developer experience. This PR adds a `PhysicalWriteInfo` interface that is passed to `createBatchWriterFactory` and `createStreamingWriterFactory` that adds the number of partitions of the data that is going to be written. ### Why are the changes needed? Passing in the number of partitions on the WriteBuilder would enable data sources to provision their write targets before starting to write. For example: - it could be used to provision a Kafka topic with a specific number of partitions - it could be used to scale a microservice prior to sending the data to it - it could be used to create a DsV2 that sends the data to another spark cluster (currently not possible since the reader wouldn't be able to know the number of partitions) ### Does this PR introduce any user-facing change? No ### How was this patch tested? Tests passed
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