[SPARK-12941][SQL][MASTER] Spark-SQL JDBC Oracle dialect fails to map string...
[SPARK-12941][SQL][MASTER] Spark-SQL JDBC Oracle dialect fails to map string datatypes to Oracle VARCHAR datatype mapping ## What changes were proposed in this pull request? A test suite added for the bug fix -SPARK 12941; for the mapping of the StringType to corresponding in Oracle ## How was this patch tested? manual tests done (Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests) (If this patch involves UI changes, please attach a screenshot; otherwise, remove this) Author: thomastechs <thomas.sebastian@tcs.com> Author: THOMAS SEBASTIAN <thomas.sebastian@tcs.com> Closes #11489 from thomastechs/thomastechs-12941-master-new.
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