[GitHub] [spark] WeichenXu123 opened a new pull request #24473: [SPARK-27534][SQL] Do not load `content` column in binary data source if it is not selected

[GitBox <gi...@apache.org>]

WeichenXu123 opened a new pull request #24473: [SPARK-27534][SQL] Do not load `content` column in binary data source if it is not selected
URL: https://github.com/apache/spark/pull/24473
 
 
   ## What changes were proposed in this pull request?
   
   A follow-up task from SPARK-25348. To save I/O cost, Spark shouldn't attempt to read the file if users didn't request the `content` column. For example:
   ```
   spark.read.format("binaryFile").load(path).filter($"length" < 1000000).count()
   ```
   
   ## How was this patch tested?
   
   Unit test added.
   
   Please review http://spark.apache.org/contributing.html before opening a pull request.
   

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