[ARROW-6078] [Java] Implement dictionary-encoded subfields for List type

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.15.0
• Component/s: Java
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/22478
• Assignee: Ji Liu
• Reporter: Ji Liu
• Created: 31/Jul/19 03:33
• Updated: 11/Jan/23 07:44
• Resolved: 31/Aug/19 02:55

Description

For example, int type List (valueCount = 5) has data like below:

10, 20

10, 20

30, 40, 50

30, 40, 50

10, 20

could be encoded to:

0, 1

0, 1

2, 3, 4

2, 3, 4

0, 1

with list type dictionary

10, 20, 30, 40, 50

or

10,

20,

30,

40,

50

 

Issue Links

• links to: GitHub Pull Request #4972