[SPARK-26667] Add `Scanning Input Table` to Performance Tuning Guide

• Type: Documentation
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 2.4.1, 3.0.0
• Component/s: Documentation
• Assignee: Unassigned
• Reporter: Deegue
• Created: 19/Jan/19 09:33
• Updated: 07/Aug/19 13:07
• Resolved: 07/Aug/19 13:07

Description

We can use `CombineTextInputFormat` instead of `TextInputFormat` and set configurations to increase the speed while reading a table. 

There's no need to add spark configurations,  PR#23506, so add it to the Performance Tuning.

Issue Links

• links to: GitHub Pull Request #23593