cloud-fan opened a new pull request #23430: [SPARK-26520][SQL] data source v2 API refactor (micro-batch read) URL: https://github.com/apache/spark/pull/23430 ## What changes were proposed in this pull request? Following https://github.com/apache/spark/pull/23086, this PR does the API refactor for micro-batch read, w.r.t. the doc [proposal](https://docs.google.com/document/d/1uUmKCpWLdh9vHxP7AWJ9EgbwB_U6T3EJYNjhISGmiQg/edit?usp=sharing) The major changes: 1. rename `XXXMicroBatchReadSupport` to `XXXMicroBatchReadStream` 2. implement `Table`, `ScanBuilder` and `Scan` for streaming sources 3. at the beginning of micro-batch streaming execution, convert `StreamingRelationV2` to `StreamingDataSourceV2Relation` directly, instead of `StreamingExecutionRelation`. followup: support operator pushdown for stream sources ## How was this patch tested? existing tests
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