[SPARK-24574][SQL] array_contains, array_position, array_remove and element_at functions deal with Column type#21581

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Commits on Jun 17, 2018

array_contains function deals with Column type for the second parameter.

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add unit test for Column type

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Commits on Jun 18, 2018

array_position deals with Column Type

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array_remove function deals with Column Type

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element_at function deals with Column Type

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reset doc for array_contains function

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Commits on Jun 20, 2018

use lit() and add unit tests

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use lit() to unify the cases

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