Cherry pick Reduce memory usage of concat (large)utf8 to active_release

[alamb]

Automatic cherry-pick of e801d4b

• Originally appeared in Reduce memory usage of concat (large)utf8 #348: Reduce memory usage of concat (large)utf8

Manual cherry-pick of 0cbf85a from #382

[alamb]

@ritchie46 / @jorgecarleitao should we backport this one? there appears to be an outstanding question: #348 (comment)

[codecov-commenter]

Codecov Report

Merging #411 (0cbf85a) into active_release (cd95d7c) will increase coverage by 0.07%.
The diff coverage is 88.84%.

❗ Current head 0cbf85a differs from pull request most recent head d5668ff. Consider uploading reports for the commit d5668ff to get more accurate results

@@                Coverage Diff                 @@
##           active_release     #411      +/-   ##
==================================================
+ Coverage           82.54%   82.62%   +0.07%     
==================================================
  Files                 162      162              
  Lines               44093    44651     +558     
==================================================
+ Hits                36398    36892     +494     
- Misses               7695     7759      +64     

Impacted Files	Coverage Δ
arrow/src/array/array_boolean.rs	90.90% <ø> (ø)
arrow/src/array/array_primitive.rs	92.93% <ø> (ø)
arrow/src/array/array_string.rs	96.05% <ø> (ø)
arrow/src/array/raw_pointer.rs	100.00% <ø> (ø)
arrow/src/buffer/ops.rs	96.96% <ø> (ø)
arrow/src/compute/kernels/aggregate.rs	73.40% <ø> (ø)
arrow/src/compute/kernels/cast_utils.rs	92.50% <ø> (ø)
arrow/src/compute/kernels/comparison.rs	95.84% <ø> (ø)
arrow/src/compute/kernels/length.rs	100.00% <ø> (ø)
arrow/src/csv/writer.rs	82.64% <ø> (ø)
... and 40 more

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[ritchie46]

@ritchie46 / @jorgecarleitao should we backport this one? there appears to be an outstanding question: #348 (comment)

I addressed the outstanding question in #382. This addresses the concerns for the other kernels. I think that that should be merged in first, and then both can be cherry picked at the same time.

[alamb]

I cherry picked 0cbf85a from #382 as well