Fangchen Li created SPARK-58043:
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Summary: Use explicit .apply instead of a case class companion as
a function
Key: SPARK-58043
URL: https://issues.apache.org/jira/browse/SPARK-58043
Project: Spark
Issue Type: Sub-task
Components: Spark Core
Affects Versions: 4.3.0
Reporter: Fangchen Li
In Scala 2, a case class's companion object extends FunctionN, so the bare
companion can be passed where a function is expected (xs.map(Foo),
reduceLeft(And)). Scala 3 removed this, so such call sites fail to compile.
Replacing Foo with Foo.apply (the method that FunctionN forwarded to) is
byte-identical in Scala 2.13 and compiles on both versions. Affects 190 call
sites across catalyst/sql-core/hive/sql-api.
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