mirror of
https://github.com/ClickHouse/ClickHouse.git
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116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
#pragma once
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#include <DB/Functions/IFunction.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/Columns/ColumnNullable.h>
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namespace DB
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{
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class FunctionIsNull : public IFunction
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{
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public:
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static constexpr auto name = "isNull";
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionIsNull>(); }
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std::string getName() const override
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{
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return name;
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}
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bool hasSpecialSupportForNulls() const override
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{
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return true;
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}
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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("Number of arguments for function " + getName() + " doesn't match: passed "
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+ toString(arguments.size()) + ", should be 1.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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return std::make_shared<DataTypeUInt8>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
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{
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ColumnWithTypeAndName & elem = block.getByPosition(arguments[0]);
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if (elem.column->isNullable())
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{
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// Merely return the embedded null map.
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ColumnNullable & nullable_col = static_cast<ColumnNullable &>(*elem.column);
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block.getByPosition(result).column = nullable_col.getNullValuesByteMap();
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}
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else
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{
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/// Since no element is nullable, create a zero-filled null map.
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ColumnPtr holder = std::make_shared<ColumnUInt8>();
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ColumnUInt8 & content = static_cast<ColumnUInt8 &>(*(holder.get()));
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NullValuesByteMap & null_map = content.getData();
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null_map.resize_fill(elem.column.get()->size());
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block.getByPosition(result).column = holder;
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}
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}
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};
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class FunctionIsNotNull : public IFunction
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{
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public:
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static constexpr auto name = "isNotNull";
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionIsNotNull>(); }
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std::string getName() const override
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{
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return name;
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}
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bool hasSpecialSupportForNulls() const override
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{
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return true;
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}
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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("Number of arguments for function " + getName() + " doesn't match: passed "
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+ toString(arguments.size()) + ", should be 1.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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return std::make_shared<DataTypeUInt8>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
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{
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ColumnWithTypeAndName & elem = block.getByPosition(arguments[0]);
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if (elem.column->isNullable())
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{
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/// Create a complemented null map.
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const ColumnNullable & src_nullable_col = static_cast<const ColumnNullable &>(*elem.column);
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const ColumnUInt8 & src_content = static_cast<const ColumnUInt8 &>(*(src_nullable_col.getNullValuesByteMap().get()));
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ColumnPtr holder = src_content.clone();
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ColumnUInt8 & dest_content = static_cast<ColumnUInt8 &>(*(holder.get()));
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NullValuesByteMap & dest_null_map = dest_content.getData();
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for (auto & byte : dest_null_map)
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byte = ((byte == 0) ? 1 : 0);
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block.getByPosition(result).column = holder;
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}
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else
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{
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/// Since no element is nullable, create a one-filled null map.
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ColumnPtr holder = std::make_shared<ColumnUInt8>();
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ColumnUInt8 & content = static_cast<ColumnUInt8 &>(*(holder.get()));
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NullValuesByteMap & null_map = content.getData();
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null_map.resize_fill(elem.column.get()->size(), 1);
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block.getByPosition(result).column = holder;
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}
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}
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};
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}
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