ClickHouse

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#include <DataTypes/DataTypeString.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionStringToString.h>
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#include <Functions/LowerUpperImpl.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 NameLower
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{
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    static constexpr auto name = "lower";
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};
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using FunctionLower = FunctionStringToString<LowerUpperImpl<'A', 'Z'>, NameLower>;
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}
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REGISTER_FUNCTION(Lower)
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{
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    factory.registerFunction<FunctionLower>({}, FunctionFactory::CaseInsensitive);
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    factory.registerAlias("lcase", NameLower::name, FunctionFactory::CaseInsensitive);
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}
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}
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