hvanhovell opened a new pull request #26013: [SPARK-29347] This PR adds JSON serialization for Spark external Rows. URL: https://github.com/apache/spark/pull/26013 ### What changes were proposed in this pull request? This PR adds JSON serialization for Spark external Rows. ### Why are the changes needed? This is to be used for observable metrics where the `StreamingQueryProgress` contains a map of observed metrics rows which needs to be serialized in some cases. ### Does this PR introduce any user-facing change? Yes, a user can call `toJson` on rows returned when collecting a DataFrame to the driver. ### How was this patch tested? Added a new test suite: `RowJsonSuite` that should test this.
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