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[SPARK-8283][SQL] Resolve udf_struct test failure in HiveCompatibilit…
…ySuite This PR aimed to resolve udf_struct test failure in HiveCompatibilitySuite. Currently, this is done by loosening CreateStruct's children type from NamedExpression to Expression and automatically generating StructField name for non-NamedExpression children. The naming convention for unnamed children follows the udf's counterpart in Hive: `col1, col2, col3, ...` Author: Yijie Shen <henry.yijieshen@gmail.com> Closes apache#6828 from yijieshen/SPARK-8283 and squashes the following commits: 6052b73 [Yijie Shen] Doc fix 677e0b7 [Yijie Shen] Resolve udf_struct test failure by automatically generate structField name for non-NamedExpression children
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