WitJakuczun opened a new pull request #24797: Detecting key in map type when value type is complex URL: https://github.com/apache/spark/pull/24797 Regex used to extract key failed when one had more complex types like `map<string,struct<description:string,ip:string,struct<a:integer>>>`. As we accept only string or character for the field I suggest using them directly in regex. ## What changes were proposed in this pull request? Corrected regex for detecting key in map type when value type is complex ## How was this patch tested? This patch was manually tested with SparkR 2.4.3 Please review https://spark.apache.org/contributing.html before opening a pull request.
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