Update array_min and array_max to use new cudf operations

[revans2]

CUDF finished work on segmented min and segmented max for strings and decimal. This lets us delete a lot of code and hopefully thing run even faster now too.

[revans2]

build

[jlowe]

Nice! Has unused imports that failed the verify build, but otherwise lgtm.

[revans2]

build

[revans2]

Our build system is too complicated. I do a build/buildall but it does not update the docs or warn me about style. So I have to do a buildall and a regular build for a single version to get everything I need to check before pushing something. This is really frustrating.

[gerashegalov]

LGTM

[gerashegalov]

Our build system is too complicated. I do a build/buildall but it does not update the docs or warn me about style. So I have to do a buildall and a regular build for a single version to get everything I need to check before pushing something. This is really frustrating.

One can obviously add whatever is missing to buildall . It does scalastyle on the lowest shim involved.

At least now we receive this automated feedback in a couple of minutes instead of waiting for hours: htps://github.com/NVIDIA/spark-rapids/runs/6528205143?check_suite_focus=true

[revans2]

@gerashegalov yes the few mins is so very nice compared to before.