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Support array expressions for __getitem__ #810

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@timsaucer

Description

@timsaucer

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

If you have an expression that is an array, it would be convenient to do something like df.select(col("a")[0]) to get the first item in that array.

Describe the solution you'd like

This could be done with a simple check of the argument to __getitem__. If it is a string or expression, continue to do what we do now. If it is a number then we call functions.array_element.

Describe alternatives you've considered

Current work around is to use functions.array_element.

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