Github user maropu commented on the issue:
https://github.com/apache/spark/pull/22154
IIUC `CacheLoader` throws `ExecutionException ` when
`CodeGenerator.doCompile` throws `InternalCompilerException` or
`CompileException`;
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala#L1305
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