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229 lines
10 KiB
C++
229 lines
10 KiB
C++
#pragma once
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#include <Columns/IColumn.h>
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#include <Columns/IColumnImpl.h>
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#include <Columns/ColumnVector.h>
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#include <Core/Defines.h>
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#include <Common/typeid_cast.h>
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#include <Common/assert_cast.h>
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namespace DB
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{
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/** A column of array values.
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* In memory, it is represented as one column of a nested type, whose size is equal to the sum of the sizes of all arrays,
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* and as an array of offsets in it, which allows you to get each element.
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*/
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class ColumnArray final : public COWHelper<IColumn, ColumnArray>
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{
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private:
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friend class COWHelper<IColumn, ColumnArray>;
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/** Create an array column with specified values and offsets. */
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ColumnArray(MutableColumnPtr && nested_column, MutableColumnPtr && offsets_column);
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/** Create an empty column of arrays with the type of values as in the column `nested_column` */
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explicit ColumnArray(MutableColumnPtr && nested_column);
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ColumnArray(const ColumnArray &) = default;
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struct ComparatorBase;
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using ComparatorAscendingUnstable = ComparatorAscendingUnstableImpl<ComparatorBase>;
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using ComparatorAscendingStable = ComparatorAscendingStableImpl<ComparatorBase>;
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using ComparatorDescendingUnstable = ComparatorDescendingUnstableImpl<ComparatorBase>;
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using ComparatorDescendingStable = ComparatorDescendingStableImpl<ComparatorBase>;
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using ComparatorEqual = ComparatorEqualImpl<ComparatorBase>;
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struct ComparatorCollationBase;
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using ComparatorCollationAscendingUnstable = ComparatorAscendingUnstableImpl<ComparatorCollationBase>;
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using ComparatorCollationAscendingStable = ComparatorAscendingStableImpl<ComparatorCollationBase>;
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using ComparatorCollationDescendingUnstable = ComparatorDescendingUnstableImpl<ComparatorCollationBase>;
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using ComparatorCollationDescendingStable = ComparatorDescendingStableImpl<ComparatorCollationBase>;
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using ComparatorCollationEqual = ComparatorEqualImpl<ComparatorCollationBase>;
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public:
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/** Create immutable column using immutable arguments. This arguments may be shared with other columns.
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* Use IColumn::mutate in order to make mutable column and mutate shared nested columns.
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*/
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using Base = COWHelper<IColumn, ColumnArray>;
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static Ptr create(const ColumnPtr & nested_column, const ColumnPtr & offsets_column)
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{
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return ColumnArray::create(nested_column->assumeMutable(), offsets_column->assumeMutable());
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}
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static Ptr create(const ColumnPtr & nested_column)
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{
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return ColumnArray::create(nested_column->assumeMutable());
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}
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template <typename ... Args>
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requires (IsMutableColumns<Args ...>::value)
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static MutablePtr create(Args &&... args) { return Base::create(std::forward<Args>(args)...); }
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/** On the index i there is an offset to the beginning of the i + 1 -th element. */
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using ColumnOffsets = ColumnVector<Offset>;
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std::string getName() const override;
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const char * getFamilyName() const override { return "Array"; }
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TypeIndex getDataType() const override { return TypeIndex::Array; }
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MutableColumnPtr cloneResized(size_t size) const override;
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size_t size() const override;
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Field operator[](size_t n) const override;
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void get(size_t n, Field & res) const override;
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StringRef getDataAt(size_t n) const override;
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bool isDefaultAt(size_t n) const override;
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void insertData(const char * pos, size_t length) override;
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StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override;
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const char * deserializeAndInsertFromArena(const char * pos) override;
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const char * skipSerializedInArena(const char * pos) const override;
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void updateHashWithValue(size_t n, SipHash & hash) const override;
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void updateWeakHash32(WeakHash32 & hash) const override;
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void updateHashFast(SipHash & hash) const override;
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void insertRangeFrom(const IColumn & src, size_t start, size_t length) override;
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void insert(const Field & x) override;
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void insertFrom(const IColumn & src_, size_t n) override;
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void insertDefault() override;
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void popBack(size_t n) override;
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ColumnPtr filter(const Filter & filt, ssize_t result_size_hint) const override;
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void expand(const Filter & mask, bool inverted) override;
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ColumnPtr permute(const Permutation & perm, size_t limit) const override;
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ColumnPtr index(const IColumn & indexes, size_t limit) const override;
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template <typename Type> ColumnPtr indexImpl(const PaddedPODArray<Type> & indexes, size_t limit) const;
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int compareAt(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint) const override;
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void compareColumn(const IColumn & rhs, size_t rhs_row_num,
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PaddedPODArray<UInt64> * row_indexes, PaddedPODArray<Int8> & compare_results,
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int direction, int nan_direction_hint) const override;
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int compareAtWithCollation(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint, const Collator & collator) const override;
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bool hasEqualValues() const override;
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void getPermutation(PermutationSortDirection direction, PermutationSortStability stability,
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size_t limit, int nan_direction_hint, Permutation & res) const override;
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void updatePermutation(PermutationSortDirection direction, PermutationSortStability stability,
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size_t limit, int nan_direction_hint, Permutation & res, EqualRanges & equal_ranges) const override;
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void getPermutationWithCollation(const Collator & collator, PermutationSortDirection direction, PermutationSortStability stability,
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size_t limit, int nan_direction_hint, Permutation & res) const override;
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void updatePermutationWithCollation(const Collator & collator, PermutationSortDirection direction, PermutationSortStability stability,
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size_t limit, int nan_direction_hint, Permutation & res, EqualRanges& equal_ranges) const override;
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void reserve(size_t n) override;
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void ensureOwnership() override;
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size_t byteSize() const override;
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size_t byteSizeAt(size_t n) const override;
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size_t allocatedBytes() const override;
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void protect() override;
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ColumnPtr replicate(const Offsets & replicate_offsets) const override;
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ColumnPtr convertToFullColumnIfConst() const override;
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void getExtremes(Field & min, Field & max) const override;
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bool hasEqualOffsets(const ColumnArray & other) const;
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/** More efficient methods of manipulation */
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IColumn & getData() { return *data; }
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const IColumn & getData() const { return *data; }
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IColumn & getOffsetsColumn() { return *offsets; }
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const IColumn & getOffsetsColumn() const { return *offsets; }
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Offsets & ALWAYS_INLINE getOffsets()
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{
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return assert_cast<ColumnOffsets &>(*offsets).getData();
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}
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const Offsets & ALWAYS_INLINE getOffsets() const
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{
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return assert_cast<const ColumnOffsets &>(*offsets).getData();
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}
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const ColumnPtr & getDataPtr() const { return data; }
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ColumnPtr & getDataPtr() { return data; }
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const ColumnPtr & getOffsetsPtr() const { return offsets; }
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ColumnPtr & getOffsetsPtr() { return offsets; }
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MutableColumns scatter(ColumnIndex num_columns, const Selector & selector) const override
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{
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return scatterImpl<ColumnArray>(num_columns, selector);
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}
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void gather(ColumnGathererStream & gatherer_stream) override;
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ColumnPtr compress() const override;
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void forEachSubcolumn(ColumnCallback callback) const override
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{
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callback(offsets);
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callback(data);
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}
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void forEachSubcolumnRecursively(RecursiveColumnCallback callback) const override
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{
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callback(*offsets);
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offsets->forEachSubcolumnRecursively(callback);
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callback(*data);
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data->forEachSubcolumnRecursively(callback);
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}
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bool structureEquals(const IColumn & rhs) const override
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{
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if (const auto * rhs_concrete = typeid_cast<const ColumnArray *>(&rhs))
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return data->structureEquals(*rhs_concrete->data);
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return false;
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}
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double getRatioOfDefaultRows(double sample_ratio) const override;
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void getIndicesOfNonDefaultRows(Offsets & indices, size_t from, size_t limit) const override;
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void finalize() override { data->finalize(); }
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bool isFinalized() const override { return data->isFinalized(); }
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bool isCollationSupported() const override { return getData().isCollationSupported(); }
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size_t getNumberOfDimensions() const;
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private:
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WrappedPtr data;
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WrappedPtr offsets;
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size_t ALWAYS_INLINE offsetAt(ssize_t i) const { return getOffsets()[i - 1]; }
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size_t ALWAYS_INLINE sizeAt(ssize_t i) const { return getOffsets()[i] - getOffsets()[i - 1]; }
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/// Multiply values if the nested column is ColumnVector<T>.
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template <typename T>
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ColumnPtr replicateNumber(const Offsets & replicate_offsets) const;
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/// Multiply the values if the nested column is ColumnString. The code is too complicated.
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ColumnPtr replicateString(const Offsets & replicate_offsets) const;
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/** Non-constant arrays of constant values are quite rare.
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* Most functions can not work with them, and does not create such columns as a result.
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* An exception is the function `replicate` (see FunctionsMiscellaneous.h), which has service meaning for the implementation of lambda functions.
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* Only for its sake is the implementation of the `replicate` method for ColumnArray(ColumnConst).
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*/
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ColumnPtr replicateConst(const Offsets & replicate_offsets) const;
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/** The following is done by simply replicating of nested columns.
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*/
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ColumnPtr replicateTuple(const Offsets & replicate_offsets) const;
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ColumnPtr replicateNullable(const Offsets & replicate_offsets) const;
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ColumnPtr replicateGeneric(const Offsets & replicate_offsets) const;
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/// Specializations for the filter function.
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template <typename T>
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ColumnPtr filterNumber(const Filter & filt, ssize_t result_size_hint) const;
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ColumnPtr filterString(const Filter & filt, ssize_t result_size_hint) const;
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ColumnPtr filterTuple(const Filter & filt, ssize_t result_size_hint) const;
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ColumnPtr filterNullable(const Filter & filt, ssize_t result_size_hint) const;
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ColumnPtr filterGeneric(const Filter & filt, ssize_t result_size_hint) const;
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int compareAtImpl(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint, const Collator * collator=nullptr) const;
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};
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}
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