gr4ve edited a comment on issue #1766: [CALCITE-3745] UnitCompiler can not find required class information. URL: https://github.com/apache/calcite/pull/1766#issuecomment-575609374 > The fix looks strange. Thread.currentThread().getContextClassLoader() does not seem to be the right approach because getContextClassLoader might be unpredictable. Thread.currentThread().getContextClassLoader() will give user a choice, user can injects ClassLoader what he wants, It is very useful. For example, I have a project has two modules, first one is a system module, it uses system ClassLoader, most Calcite classes are loaded by this ClassLoader, the second one is a dynamic module, it has a child ClassLoader of system ClassLoader and contains some UDF classes and sql content, the UDFs are loaded by the second ClassLoader. When calcite trigger a compile procedure, the compiler will use the system loader to compile the generated source code and it will throw a CompileException, because the compiler can not find UDFs' class in first ClassLoader.
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