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DataTypeMap.h
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69 lines (50 loc) · 2.26 KB
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#pragma once
#include <DataTypes/IDataType.h>
namespace DB
{
/** Map data type.
* Map is implemented as two arrays of keys and values.
* Serialization of type 'Map(K, V)' is similar to serialization.
* of 'Array(Tuple(keys K, values V))' or in other words of 'Nested(keys K, valuev V)'.
*/
class DataTypeMap final : public IDataType
{
private:
DataTypePtr key_type;
DataTypePtr value_type;
/// 'nested' is an Array(Tuple(key_type, value_type))
DataTypePtr nested;
public:
static constexpr bool is_parametric = true;
explicit DataTypeMap(const DataTypePtr & nested_);
explicit DataTypeMap(const DataTypes & elems);
DataTypeMap(const DataTypePtr & key_type_, const DataTypePtr & value_type_);
TypeIndex getTypeId() const override { return TypeIndex::Map; }
std::string doGetName() const override;
std::string doGetPrettyName(size_t indent) const override;
const char * getFamilyName() const override { return "Map"; }
bool canBeInsideNullable() const override { return false; }
MutableColumnPtr createColumn() const override;
Field getDefault() const override;
bool equals(const IDataType & rhs) const override;
bool isComparable() const override { return key_type->isComparable() && value_type->isComparable(); }
bool isParametric() const override { return true; }
bool haveSubtypes() const override { return true; }
bool hasDynamicSubcolumnsDeprecated() const override { return nested->hasDynamicSubcolumnsDeprecated(); }
DataTypePtr getNormalizedType() const override
{
return std::make_shared<DataTypeMap>(key_type->getNormalizedType(), value_type->getNormalizedType());
}
const DataTypePtr & getKeyType() const { return key_type; }
const DataTypePtr & getValueType() const { return value_type; }
void updateHashImpl(SipHash & hash) const override;
DataTypes getKeyValueTypes() const { return {key_type, value_type}; }
const DataTypePtr & getNestedType() const { return nested; }
DataTypePtr getNestedTypeWithUnnamedTuple() const;
SerializationPtr doGetDefaultSerialization() const override;
static bool isValidKeyType(DataTypePtr key_type);
void forEachChild(const ChildCallback & callback) const override;
private:
void assertKeyType() const;
};
}