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495c6e03aa
* Replace all Context references with std::weak_ptr * Fix shared context captured by value * Fix build * Fix Context with named sessions * Fix copy context * Fix gcc build * Merge with master and fix build * Fix gcc-9 build
105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionFactory.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/getLeastSupertype.h>
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#include <Columns/ColumnArray.h>
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#include <Interpreters/castColumn.h>
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namespace DB
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{
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/// array(c1, c2, ...) - create an array.
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class FunctionArray : public IFunction
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{
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public:
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static constexpr auto name = "array";
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static FunctionPtr create(ContextPtr)
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{
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return std::make_shared<FunctionArray>();
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}
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bool useDefaultImplementationForNulls() const override { return false; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isVariadic() const override { return true; }
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size_t getNumberOfArguments() const override { return 0; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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return std::make_shared<DataTypeArray>(getLeastSupertype(arguments));
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
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{
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size_t num_elements = arguments.size();
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if (num_elements == 0)
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/// We should return constant empty array.
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return result_type->createColumnConstWithDefaultValue(input_rows_count);
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const DataTypePtr & elem_type = static_cast<const DataTypeArray &>(*result_type).getNestedType();
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/** If part of columns have not same type as common type of all elements of array,
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* then convert them to common type.
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* If part of columns are constants,
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* then convert them to full columns.
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*/
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Columns columns_holder(num_elements);
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ColumnRawPtrs column_ptrs(num_elements);
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for (size_t i = 0; i < num_elements; ++i)
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{
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const auto & arg = arguments[i];
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ColumnPtr preprocessed_column = arg.column;
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if (!arg.type->equals(*elem_type))
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preprocessed_column = castColumn(arg, elem_type);
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preprocessed_column = preprocessed_column->convertToFullColumnIfConst();
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columns_holder[i] = std::move(preprocessed_column);
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column_ptrs[i] = columns_holder[i].get();
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}
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/// Create and fill the result array.
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auto out = ColumnArray::create(elem_type->createColumn());
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IColumn & out_data = out->getData();
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IColumn::Offsets & out_offsets = out->getOffsets();
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out_data.reserve(input_rows_count * num_elements);
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out_offsets.resize(input_rows_count);
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IColumn::Offset current_offset = 0;
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for (size_t i = 0; i < input_rows_count; ++i)
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{
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for (size_t j = 0; j < num_elements; ++j)
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out_data.insertFrom(*column_ptrs[j], i);
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current_offset += num_elements;
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out_offsets[i] = current_offset;
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}
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return out;
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}
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private:
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String getName() const override
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{
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return name;
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}
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bool addField(DataTypePtr type_res, const Field & f, Array & arr) const;
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};
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void registerFunctionArray(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionArray>();
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}
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}
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