[jira] [Created] (SPARK-27534) Do not load `content` column in binary data source if it is not selected

["Xiangrui Meng (JIRA)" <ji...@apache.org>]

Xiangrui Meng created SPARK-27534:
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             Summary: Do not load `content` column in binary data source if it is not selected
                 Key: SPARK-27534
                 URL: https://issues.apache.org/jira/browse/SPARK-27534
             Project: Spark
          Issue Type: Story
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Xiangrui Meng


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:

{code}
spark.read.format("binaryFile").load(path).filter($"length" < 1000000).count()
{code}




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