Deegue opened a new pull request #23593: [SPARK-26667][DOC]Add `Scanning Input 
Table` to Performance Tuning Guide
URL: https://github.com/apache/spark/pull/23593
 
 
   ## What changes were proposed in this pull request?
   
   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, so add it to the Performance 
Tuning.
   
   Linked to #23506 
   
   ## How was this patch tested?
   
   Manually tested
   

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