[ARROW-1361] [Java] Add accessors to get type parameters from vector classes

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: Java
• Labels: starter
• External issue URL: https://github.com/apache/arrow/issues/17391
• Assignee: Unassigned
• Reporter: Bryan Cutler
• Created: 16/Aug/17 18:41
• Updated: 11/Jan/23 07:14

Description

Vector classes contain private copies of each param in the ArrowType, but does not have any public api to access them. So if given a vector you would have to get the Field from the and cast to the correct type. For example, with a TimeStampMicroTZVector and trying to get the timezone:

if field.getType.isInstanceOf[ArrowType.Timestamp] &&
          field.getType.asInstanceOf[ArrowType.Timestamp].getTimezone

It would be more convenient to have direct accessors for these type params for the vector types that have parameters:

• DecimalVector
• FixedSizeBinaryVector
• ListVector
• TimeStamps with timezones
• FixedSizedListVector
• Unions

Issue Links

• links to: GitHub Pull Request #972