Maxim Gekk created SPARK-30309:
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Summary: Mark `Filter` as a `sealed` class
Key: SPARK-30309
URL: https://issues.apache.org/jira/browse/SPARK-30309
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Maxim Gekk
Add the `sealed` keyword to the `Filter` class at the
`org.apache.spark.sql.sources` package. So, the compiler should output a
warning if handling of a filter is missed in a datasource:
{code}
Warning:(154, 65) match may not be exhaustive.
It would fail on the following inputs: AlwaysFalse(), AlwaysTrue()
def translate(filter: sources.Filter): Option[Expression] = filter match {
{code}
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