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76 lines
3.0 KiB
C++
76 lines
3.0 KiB
C++
#pragma once
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#include <Columns/IColumn.h>
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/// Common helper methods for implementation of different columns.
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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/// Counts how many bytes of `filt` are greater than zero.
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size_t countBytesInFilter(const IColumn::Filter & filt);
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/// Returns vector with num_columns elements. vector[i] is the count of i values in selector.
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/// Selector must contain values from 0 to num_columns - 1. NOTE: this is not checked.
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std::vector<size_t> countColumnsSizeInSelector(IColumn::ColumnIndex num_columns, const IColumn::Selector & selector);
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/// Returns true, if the memory contains only zeros.
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bool memoryIsZero(const void * data, size_t size);
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/// The general implementation of `filter` function for ColumnArray and ColumnString.
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template <typename T>
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void filterArraysImpl(
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const PaddedPODArray<T> & src_elems, const IColumn::Offsets & src_offsets,
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PaddedPODArray<T> & res_elems, IColumn::Offsets & res_offsets,
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const IColumn::Filter & filt, ssize_t result_size_hint);
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/// Same as above, but not fills res_offsets.
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template <typename T>
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void filterArraysImplOnlyData(
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const PaddedPODArray<T> & src_elems, const IColumn::Offsets & src_offsets,
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PaddedPODArray<T> & res_elems,
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const IColumn::Filter & filt, ssize_t result_size_hint);
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namespace detail
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{
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template <typename T>
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const PaddedPODArray<T> * getIndexesData(const IColumn & indexes);
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}
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/// Check limit <= indexes->size() and call column.indexImpl(const PaddedPodArray<Type> & indexes, UInt64 limit).
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template <typename Column>
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ColumnPtr selectIndexImpl(const Column & column, const IColumn & indexes, size_t limit)
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{
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if (limit == 0)
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limit = indexes.size();
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if (indexes.size() < limit)
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throw Exception("Size of indexes is less than required.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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if (auto * data_uint8 = detail::getIndexesData<UInt8>(indexes))
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return column.template indexImpl<UInt8>(*data_uint8, limit);
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else if (auto * data_uint16 = detail::getIndexesData<UInt16>(indexes))
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return column.template indexImpl<UInt16>(*data_uint16, limit);
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else if (auto * data_uint32 = detail::getIndexesData<UInt32>(indexes))
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return column.template indexImpl<UInt32>(*data_uint32, limit);
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else if (auto * data_uint64 = detail::getIndexesData<UInt64>(indexes))
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return column.template indexImpl<UInt64>(*data_uint64, limit);
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else
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throw Exception("Indexes column for IColumn::select must be ColumnUInt, got" + indexes.getName(),
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ErrorCodes::LOGICAL_ERROR);
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}
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#define INSTANTIATE_INDEX_IMPL(Column) \
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template ColumnPtr Column::indexImpl<UInt8>(const PaddedPODArray<UInt8> & indexes, size_t limit) const; \
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template ColumnPtr Column::indexImpl<UInt16>(const PaddedPODArray<UInt16> & indexes, size_t limit) const; \
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template ColumnPtr Column::indexImpl<UInt32>(const PaddedPODArray<UInt32> & indexes, size_t limit) const; \
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template ColumnPtr Column::indexImpl<UInt64>(const PaddedPODArray<UInt64> & indexes, size_t limit) const;
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}
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