[ARROW-6764] [C++] Add readahead iterator

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/23103
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 02/Oct/19 10:56
• Updated: 11/Jan/23 07:49
• Resolved: 09/Oct/19 09:42

Description

This could replace the current ad-hoc ReadaheadSpooler, at least for JSON.
CSV currently uses non-zero padding, but it could switch to the same strategy as JSON (i.e. keep track of partial / completion blocks).

Issue Links

• supercedes: ARROW-501 [C++] Implement concurrent / buffering InputStream for streaming data use cases
• links to: GitHub Pull Request #5573