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Improve docs for NullArray, new_null_array and new_empty_array #240

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merged 2 commits into from
May 3, 2021

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alamb
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@alamb alamb commented Apr 29, 2021

Rationale for this change

I have often found myself being confused and searching for this code, so I am hoping to leave some hints to find it. Here is an example where it may have helped: apache/datafusion#223 (though to be honest new_null_array may be newer than the code in datafusion

What changes are included in this PR?

  1. Add some comments in NullArray pointing at new_null_array and move comments to NullArray rather than module
  2. Add doc examples to new_null_array and new_empty_array

Are there any user-facing changes?

Better docs

@alamb alamb added documentation Improvements or additions to documentation arrow Changes to the arrow crate labels Apr 29, 2021
@@ -42,12 +25,33 @@ use crate::array::{Array, ArrayData};
use crate::datatypes::*;

/// An Array where all elements are nulls
///
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By moving the description to the struct, the documentation is now on the doc page I would expect (not the module level). Here is what it looks like now:

Screen Shot 2021-04-29 at 12 54 51 PM

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Looks great! 👍 The note/link to arrow::array::new_null_array is especially handy; I have a poor man's version of this in a few codebases after I looked up NullArray, saw it was an array of the null type, and thought "ok, guess that's not supported".

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codecov-commenter commented Apr 29, 2021

Codecov Report

Merging #240 (29a1fb2) into master (4dfbca6) will not change coverage.
The diff coverage is n/a.

❗ Current head 29a1fb2 differs from pull request most recent head fea52de. Consider uploading reports for the commit fea52de to get more accurate results
Impacted file tree graph

@@           Coverage Diff           @@
##           master     #240   +/-   ##
=======================================
  Coverage   82.52%   82.52%           
=======================================
  Files         162      162           
  Lines       43672    43672           
=======================================
  Hits        36040    36040           
  Misses       7632     7632           
Impacted Files Coverage Δ
arrow/src/array/array.rs 76.07% <ø> (ø)
arrow/src/array/null.rs 86.66% <ø> (ø)

Continue to review full report at Codecov.

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@nevi-me nevi-me left a comment

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LGTM

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@jorgecarleitao jorgecarleitao left a comment

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Looks great. 👍

@alamb alamb merged commit a040c15 into apache:master May 3, 2021
@alamb alamb deleted the alamb/better_docs branch June 15, 2021 11:16
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5 participants