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## What changes were proposed in this pull request? This pr modified `elt` to output binary for binary inputs. `elt` in the current master always output data as a string. But, in some databases (e.g., MySQL), if all inputs are binary, `elt` also outputs binary (Also, this might be a small surprise). This pr is related to #19977. ## How was this patch tested? Added tests in `SQLQueryTestSuite` and `TypeCoercionSuite`. Author: Takeshi Yamamuro <yamamuro@apache.org> Closes #20135 from maropu/SPARK-22937. |
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