Maxim Gekk created SPARK-24959:
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Summary: Do not invoke the CSV/JSON parser for empty schema
Key: SPARK-24959
URL: https://issues.apache.org/jira/browse/SPARK-24959
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.1
Reporter: Maxim Gekk
Currently JSON and CSV parsers are called even if required schema is empty.
Invoking the parser per each line has some non-zero overhead. The action can be
skipped. Such optimization should speed up count(), for example.
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