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95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
#include "config.h"
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#if USE_ULID
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#include <Columns/ColumnFixedString.h>
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#include <DataTypes/DataTypeFixedString.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/IFunction.h>
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#include <Interpreters/Context.h>
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#include <ulid.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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class FunctionGenerateULID : public IFunction
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{
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public:
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static constexpr size_t ULID_LENGTH = 26;
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static constexpr auto name = "generateULID";
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static FunctionPtr create(ContextPtr /*context*/)
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{
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return std::make_shared<FunctionGenerateULID>();
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}
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 0; }
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bool isVariadic() const override { return true; }
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bool isDeterministic() const override { return false; }
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bool isDeterministicInScopeOfQuery() const override { return false; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.size() > 1)
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throw Exception(
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
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"Number of arguments for function {} doesn't match: passed {}, should be 0 or 1.",
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getName(), arguments.size());
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return std::make_shared<DataTypeFixedString>(ULID_LENGTH);
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & /*arguments*/, const DataTypePtr &, size_t input_rows_count) const override
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{
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auto col_res = ColumnFixedString::create(ULID_LENGTH);
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auto & vec_res = col_res->getChars();
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vec_res.resize(input_rows_count * ULID_LENGTH);
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ulid_generator generator;
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ulid_generator_init(&generator, 0);
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for (size_t offset = 0, size = vec_res.size(); offset < size; offset += ULID_LENGTH)
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ulid_generate(&generator, reinterpret_cast<char *>(&vec_res[offset]));
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return col_res;
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}
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};
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REGISTER_FUNCTION(GenerateULID)
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{
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factory.registerFunction<FunctionGenerateULID>(
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{
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R"(
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Generates a Universally Unique Lexicographically Sortable Identifier (ULID).
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This function takes an optional argument, the value of which is discarded to generate different values in case the function is called multiple times.
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The function returns a value of type FixedString(26).
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)",
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Documentation::Examples{
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{"ulid", "SELECT generateULID()"},
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{"multiple", "SELECT generateULID(1), generateULID(2)"}},
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Documentation::Categories{"ULID"}
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},
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FunctionFactory::CaseSensitive);
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}
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}
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#endif
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