MaxGekk opened a new pull request #23406: [SPARK-26504][SQL] Rope-wise dumping of Spark plans URL: https://github.com/apache/spark/pull/23406 ## What changes were proposed in this pull request? Proposed new class `StringRope` for converting a sequence of strings to string with one memory allocation in the `toString` method. `StringRope` replaces `StringBuilderWriter` in methods of dumping of Spark plans and codegen to strings. All `Writer` arguments are replaced by `String => Unit` in methods related to Spark plans stringification. ## How was this patch tested? It was tested by existing suites `QueryExecutionSuite`, `DebuggingSuite` as well as new tests for `StringRope` in `StringUtilsSuite`.
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