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[SPARK-20009][SQL] Support DDL strings for defining schema in functio…
…ns.from_json ## What changes were proposed in this pull request? This pr added `StructType.fromDDL` to convert a DDL format string into `StructType` for defining schemas in `functions.from_json`. ## How was this patch tested? Added tests in `JsonFunctionsSuite`. Author: Takeshi Yamamuro <yamamuro@apache.org> Closes #17406 from maropu/SPARK-20009.
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