WangGuangxin opened a new pull request #23460: escape string to keep alignment with hive URL: https://github.com/apache/spark/pull/23460 ## What changes were proposed in this pull request? In spark thriftserver mode, escape string when serialize type map/array to make it a valid json, to keep alignment with hive. For example, select a field whose type is map<string, string>, currently the spark thrift server returns {"author_id":"123","log_pb":"{"impr_id":"20181231"}","request_id":"001"} while hive thriftserver returns {"author_id":"123", "log_pb":"{\"impr_id\":\"20181231\"}","request_id":"001" see https://issues.apache.org/jira/browse/SPARK-26544 ## How was this patch tested? unit test
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