[SPARK-22826][SQL] findWiderTypeForTwo Fails over StructField of Array#20010

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bdrillard wants to merge 12 commits intoapache:masterfrom

bdrillard:SPARK-22826

Commits on Dec 26, 2017

[SPARK-22826] adding support for tighest type coercion over array/map types in a structfield
ALeksander Eskilson
committed
[SPARK-22826] supporting with and without string promition
ALeksander Eskilson
committed
Revert "[SPARK-22826] supporting with and without string promition"
ALeksander Eskilson
committed
[SPARK-22826] cleaning up api over wider types
ALeksander Eskilson
committed

Commits on Dec 29, 2017

[SPARK-22826] adding more test cases
ALeksander Eskilson
committed
[SPARK-22826] checking to sameType on complex types
ALeksander Eskilson
committed
[SPARK-22826] fixup on spacing
ALeksander Eskilson
committed
[SPARK-22826] reverting use of sameType
ALeksander Eskilson
committed
[SPARK-22826] adding sensitivity to field names and case
ALeksander Eskilson
committed
[SPARK-22826] style fixup
ALeksander Eskilson
committed
[SPARK-22826] fixing issue with boolean condition on case sensitivity
ALeksander Eskilson
committed

Commits on Jan 4, 2018

[SPARK-22826] changing array type element name
ALeksander Eskilson
committed