[jira] [Commented] (ARROW-11424) [C++] Add more StructType and StructArray methods

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-11424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17276311#comment-17276311 ] 

Antoine Pitrou commented on ARROW-11424:
----------------------------------------

They're a bit different:
 * a StructArray has a top-level validity bitmap, a RecordBatch doesn't
 * a Schema has top-level metadata, a StructType doesn't

Other than that, yes, they're quite similar.

> [C++] Add more StructType and StructArray methods
> -------------------------------------------------
>
>                 Key: ARROW-11424
>                 URL: https://issues.apache.org/jira/browse/ARROW-11424
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Neal Richardson
>            Priority: Major
>             Fix For: 4.0.0
>
>
> A StructType is basically a Schema (vector of Fields), right? Likewise, a StructArray is pretty much the same as a RecordBatch, right? Schema and RecordBatch have many more methods than StructType/StructArray, but we should be able to do the same kinds of things to structs.
> Also, an observation while working on ARROW-11423: the method to extract an Array column from a StructArray is called {{field()} and {{GetFieldByName()}}, which is confusing since Schema/StructType is what contains Field objects, and {{StructArray::field()}} returns Array, not Field.
> cc [~bkietz] [~apitrou]



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