presto-main/src/main/java/io/prestosql/operator/scalar/ArrayConcatFunction.java/ArrayConcatFunction/ArrayConcatFunction
class ArrayConcatFunction:    private ArrayConcatFunction()
    {
        super(new FunctionMetadata(
                new Signature(
                        FUNCTION_NAME,
                        ImmutableList.of(typeVariable("E")),
                        ImmutableList.of(),
                        arrayType(new TypeSignature("E")),
                        ImmutableList.of(arrayType(new TypeSignature("E"))),
                        true),
                false,
                ImmutableList.of(new FunctionArgumentDefinition(false)),
                false,
                true,
                DESCRIPTION,
                SCALAR));
    }