ClickHouse

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#include <DataTypes/DataTypeString.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionStringOrArrayToT.h>
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#include <Functions/EmptyImpl.h>
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namespace DB
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{
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namespace
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{
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struct NameEmpty
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{
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    static constexpr auto name = "empty";
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};
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using FunctionEmpty = FunctionStringOrArrayToT<EmptyImpl<false>, NameEmpty, UInt8, false>;
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}
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REGISTER_FUNCTION(Empty)
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{
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    factory.registerFunction<FunctionEmpty>();
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}
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}
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