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30 lines
850 B
C++
30 lines
850 B
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionsVisitParam.h>
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#include <Functions/FunctionsStringSearchToString.h>
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namespace DB
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{
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struct ExtractString
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{
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static void extract(const UInt8 * pos, const UInt8 * end, ColumnString::Chars & res_data)
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{
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size_t old_size = res_data.size();
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ReadBufferFromMemory in(pos, end - pos);
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if (!tryReadJSONStringInto(res_data, in))
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res_data.resize(old_size);
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}
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};
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struct NameVisitParamExtractString { static constexpr auto name = "visitParamExtractString"; };
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using FunctionVisitParamExtractString = FunctionsStringSearchToString<ExtractParamToStringImpl<ExtractString>, NameVisitParamExtractString>;
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void registerFunctionVisitParamExtractString(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionVisitParamExtractString>();
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}
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}
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