ClickHouse

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#include "FunctionsStringSearch.h"
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#include "FunctionFactory.h"
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#include "PositionImpl.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 NamePositionCaseInsensitive
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{
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    static constexpr auto name = "positionCaseInsensitive";
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};
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using FunctionPositionCaseInsensitive = FunctionsStringSearch<PositionImpl<NamePositionCaseInsensitive, PositionCaseInsensitiveASCII>>;
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}
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REGISTER_FUNCTION(PositionCaseInsensitive)
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{
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    factory.registerFunction<FunctionPositionCaseInsensitive>();
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    factory.registerAlias("instr", NamePositionCaseInsensitive::name, FunctionFactory::CaseInsensitive);
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}
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}
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