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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def install_exception_handler():
 """ Hook an exception handler into Py4j, which could capture some SQL exceptions in Java. When calling Java API, it will call `get_return_value` to parse the returned object. If any exception happened in JVM, the result will be Java exception object, it raise py4j.protocol.Py4JJavaError. We replace the original `get_return_value` with one that could capture the Java exception and throw a Python one (with the same error message). It's idempotent, could be called multiple times. """

    original = py4j.protocol.get_return_value
    # The original `get_return_value` is not patched, it's idempotent.
    patched = capture_sql_exception(original)
    # only patch the one used in py4j.java_gateway (call Java API)
    py4j.java_gateway.get_return_value = patched