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111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
#include <Columns/ColumnNullable.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnVector.h>
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#include <DataTypes/DataTypeNullable.h>
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#include <DataTypes/DataTypesNumber.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 "config.h"
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#if USE_SIMDJSON
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# include <Common/JSONParsers/SimdJSONParser.h>
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#elif USE_RAPIDJSON
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# include <Common/JSONParsers/RapidJSONParser.h>
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#else
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# include <Common/JSONParsers/DummyJSONParser.h>
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#endif
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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 ILLEGAL_COLUMN;
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}
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namespace
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{
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/// JSONArrayLength(json)
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class FunctionJSONArrayLength : public IFunction
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{
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public:
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static constexpr auto name = "JSONArrayLength";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionJSONArrayLength>(); }
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String getName() const override { return name; }
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bool isVariadic() const override { return false; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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size_t getNumberOfArguments() const override { return 1; }
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bool useDefaultImplementationForConstants() const override { return true; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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auto args = FunctionArgumentDescriptors{
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{"json", &isString<IDataType>, nullptr, "String"},
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};
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validateFunctionArgumentTypes(*this, arguments, args);
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return std::make_shared<DataTypeNullable>(std::make_shared<DataTypeUInt64>());
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}
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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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const ColumnPtr column = arguments[0].column;
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const ColumnString * col = typeid_cast<const ColumnString *>(column.get());
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if (!col)
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "First argument of function {} must be string", getName());
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auto null_map = ColumnUInt8::create();
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auto data = ColumnUInt64::create();
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null_map->reserve(input_rows_count);
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data->reserve(input_rows_count);
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#if USE_SIMDJSON
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SimdJSONParser parser;
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SimdJSONParser::Element element;
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#elif USE_RAPIDJSON
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RapidJSONParser parser;
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RapidJSONParser::Element element;
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#else
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DummyJSONParser parser;
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DummyJSONParser::Element element;
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#endif
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for (size_t i = 0; i < input_rows_count; ++i)
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{
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auto str_ref = col->getDataAt(i);
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std::string_view str_view(str_ref.data, str_ref.size);
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bool ok = parser.parse(std::move(str_view), element);
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if (!ok || !element.isArray())
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{
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null_map->insertValue(1);
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data->insertDefault();
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}
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else
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{
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auto array = element.getArray();
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null_map->insertValue(0);
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data->insertValue(array.size());
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}
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}
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return ColumnNullable::create(std::move(data), std::move(null_map));
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}
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};
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}
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REGISTER_FUNCTION(JSONArrayLength)
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{
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factory.registerFunction<FunctionJSONArrayLength>(FunctionDocumentation{
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.description="Returns the number of elements in the outermost JSON array. The function returns NULL if input JSON string is invalid."});
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/// For Spark compatibility.
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factory.registerAlias("JSON_ARRAY_LENGTH", "JSONArrayLength", FunctionFactory::CaseInsensitive);
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}
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}
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