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124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
#include <IO/WriteHelpers.h>
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#include <Columns/ColumnConst.h>
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#include <Columns/ColumnsCommon.h>
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#include <Common/PODArray.h>
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#include <Common/typeid_cast.h>
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#include <Common/WeakHash.h>
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#include <Common/HashTable/Hash.h>
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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 SIZES_OF_COLUMNS_DOESNT_MATCH;
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extern const int LOGICAL_ERROR;
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}
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ColumnConst::ColumnConst(const ColumnPtr & data_, size_t s_)
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: data(data_), s(s_)
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{
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/// Squash Const of Const.
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while (const ColumnConst * const_data = typeid_cast<const ColumnConst *>(data.get()))
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data = const_data->getDataColumnPtr();
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if (data->size() != 1)
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throw Exception("Incorrect size of nested column in constructor of ColumnConst: " + toString(data->size()) + ", must be 1.",
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ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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}
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ColumnPtr ColumnConst::convertToFullColumn() const
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{
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return data->replicate(Offsets(1, s));
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}
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ColumnPtr ColumnConst::removeLowCardinality() const
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{
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return ColumnConst::create(data->convertToFullColumnIfLowCardinality(), s);
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}
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ColumnPtr ColumnConst::filter(const Filter & filt, ssize_t /*result_size_hint*/) const
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{
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if (s != filt.size())
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throw Exception("Size of filter (" + toString(filt.size()) + ") doesn't match size of column (" + toString(s) + ")",
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ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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return ColumnConst::create(data, countBytesInFilter(filt));
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}
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ColumnPtr ColumnConst::replicate(const Offsets & offsets) const
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{
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if (s != offsets.size())
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throw Exception("Size of offsets (" + toString(offsets.size()) + ") doesn't match size of column (" + toString(s) + ")",
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ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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size_t replicated_size = 0 == s ? 0 : offsets.back();
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return ColumnConst::create(data, replicated_size);
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}
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ColumnPtr ColumnConst::permute(const Permutation & perm, size_t limit) const
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{
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if (limit == 0)
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limit = s;
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else
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limit = std::min(s, limit);
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if (perm.size() < limit)
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throw Exception("Size of permutation (" + toString(perm.size()) + ") is less than required (" + toString(limit) + ")",
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ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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return ColumnConst::create(data, limit);
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}
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ColumnPtr ColumnConst::index(const IColumn & indexes, size_t limit) const
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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 (" + toString(indexes.size()) + ") is less than required (" + toString(limit) + ")",
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ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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return ColumnConst::create(data, limit);
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}
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MutableColumns ColumnConst::scatter(ColumnIndex num_columns, const Selector & selector) const
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{
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if (s != selector.size())
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throw Exception("Size of selector (" + toString(selector.size()) + ") doesn't match size of column (" + toString(s) + ")",
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ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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std::vector<size_t> counts = countColumnsSizeInSelector(num_columns, selector);
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MutableColumns res(num_columns);
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for (size_t i = 0; i < num_columns; ++i)
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res[i] = cloneResized(counts[i]);
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return res;
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}
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void ColumnConst::getPermutation(bool /*reverse*/, size_t /*limit*/, int /*nan_direction_hint*/, Permutation & res) const
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{
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res.resize(s);
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for (size_t i = 0; i < s; ++i)
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res[i] = i;
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}
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void ColumnConst::updateWeakHash32(WeakHash32 & hash) const
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{
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if (hash.getData().size() != s)
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throw Exception("Size of WeakHash32 does not match size of column: column size is " + std::to_string(s) +
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", hash size is " + std::to_string(hash.getData().size()), ErrorCodes::LOGICAL_ERROR);
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WeakHash32 element_hash(1);
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data->updateWeakHash32(element_hash);
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size_t data_hash = element_hash.getData()[0];
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for (auto & value : hash.getData())
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value = intHashCRC32(data_hash, value);
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}
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}
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