{

/// The type of array elements.

DataTypePtr nested;

using FieldType = Array;

using ColumnType = ColumnArray;

static constexpr bool is_parametric = true;

explicit DataTypeArray(const DataTypePtr & nested_);

TypeIndex getTypeId() const override { return TypeIndex::Array; }

std::string doGetName() const override

{

return "Array(" + nested->getName() + ")";

}

std::string doGetPrettyName(size_t indent) const override;

const char * getFamilyName() const override

{

return "Array";

}

bool canBeInsideNullable() const override

{

return false;

}

MutableColumnPtr createColumn() const override;

void forEachChild(const ChildCallback & callback) const override;

Field getDefault() const override;

DataTypePtr getNormalizedType() const override { return std::make_shared<DataTypeArray>(nested->getNormalizedType()); }

bool equals(const IDataType & rhs) const override;

bool isParametric() const override { return true; }

bool haveSubtypes() const override { return true; }

bool cannotBeStoredInTables() const override { return nested->cannotBeStoredInTables(); }

bool textCanContainOnlyValidUTF8() const override { return nested->textCanContainOnlyValidUTF8(); }

bool isComparable() const override { return nested->isComparable(); }

bool canBeComparedWithCollation() const override { return nested->canBeComparedWithCollation(); }

/// Array column doesn't have subcolumns by itself but allows to read subcolumns of nested column.

/// If nested column has dynamic subcolumns, Array of this type should also be able to read these dynamic subcolumns.

bool hasDynamicSubcolumnsData() const override { return nested->hasDynamicSubcolumnsData(); }

bool hasDynamicStructure() const override { return nested->hasDynamicStructure(); }

std::unique_ptr<SubstreamData> getDynamicSubcolumnData(std::string_view subcolumn_name, const SubstreamData & data, size_t initial_array_level, bool throw_if_null) const override;

bool isValueUnambiguouslyRepresentedInContiguousMemoryRegion() const override

{

return nested->isValueUnambiguouslyRepresentedInFixedSizeContiguousMemoryRegion();

}

void updateHashImpl(SipHash & hash) const override;

SerializationPtr doGetSerialization(const SerializationInfoSettings & settings) const override;

const DataTypePtr & getNestedType() const { return nested; }

/// 1 for plain array, 2 for array of arrays and so on.

size_t getNumberOfDimensions() const;