contrib/clickhouse/src/Functions/visitParamExtractBool.cpp


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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionsVisitParam.h>
#include <Functions/FunctionsStringSearch.h>


namespace DB
{

struct ExtractBool
{
    using ResultType = UInt8;

    static UInt8 extract(const UInt8 * begin, const UInt8 * end)
    {
        return begin + 4 <= end && 0 == strncmp(reinterpret_cast<const char *>(begin), "true", 4);
    }
};

struct NameSimpleJSONExtractBool { static constexpr auto name = "simpleJSONExtractBool"; };
using FunctionSimpleJSONExtractBool = FunctionsStringSearch<ExtractParamImpl<NameSimpleJSONExtractBool, ExtractBool>>;

REGISTER_FUNCTION(VisitParamExtractBool)
{
    factory.registerFunction<FunctionSimpleJSONExtractBool>();
    factory.registerAlias("visitParamExtractBool", "simpleJSONExtractBool");
}

}