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https://issues.apache.org/jira/browse/ARROW-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350801#comment-16350801
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ASF GitHub Bot commented on ARROW-1361:
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icexelloss commented on issue #972: ARROW-1361: [Java] Adding methods to get
type param values in NullableValueVector
URL: https://github.com/apache/arrow/pull/972#issuecomment-362672731
Yeah I think `DecimalVector` should have `getPrecision()` and `getScale()`
methods. Unfortunately(?) now we need to do this on a vector by vector basis.
`FixedSizeListVector` already has `getListSize()`. I checked other vectors
seems to be fine.
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> [Java] Add minor type param accessors to NullableValueVectors
> -------------------------------------------------------------
>
> Key: ARROW-1361
> URL: https://issues.apache.org/jira/browse/ARROW-1361
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java - Vectors
> Reporter: Bryan Cutler
> Assignee: Bryan Cutler
> Priority: Major
> Labels: pull-request-available
>
> A {{NullableValueVector}} creates private copies of each param in the minor
> type, but does not have any way public api to access them. So if given a
> {{NullableValueVector}} you would have to use the {{Field}} and cast to the
> correct type. For example, with a {{NullableTimeStampMicroTZVector}} and
> trying to get the timezone:
> {noformat}
> if field.getType.isInstanceOf[ArrowType.Timestamp] &&
> field.getType.asInstanceOf[ArrowType.Timestamp].getTimezone
> {noformat}
> It would be more convenient to have direct accessors for these type params.
> Also, it is possible to do some minor refactoring because
> {{NullableValueVectors}} does not use these type params, so there is no need
> to store them. They already exist in the inner vector object and the Field
> type.
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