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97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnsCommon.h>
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#include <Columns/ColumnConst.h>
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#include <Columns/FilterDescription.h>
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#include <Interpreters/ExpressionActions.h>
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#include <Common/typeid_cast.h>
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#include <Interpreters/evaluateMissingDefaults.h>
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#include <DataStreams/AddingDefaultsBlockInputStream.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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}
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AddingDefaultsBlockInputStream::AddingDefaultsBlockInputStream(const BlockInputStreamPtr & input,
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const ColumnDefaults & column_defaults_,
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const Context & context_)
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: column_defaults(column_defaults_),
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context(context_)
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{
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children.push_back(input);
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header = input->getHeader();
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}
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Block AddingDefaultsBlockInputStream::readImpl()
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{
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Block res = children.back()->read();
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if (!res)
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return res;
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if (column_defaults.empty())
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return res;
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BlockDelayedDefaults delayed_defaults = res.delayed_defaults;
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if (delayed_defaults.empty())
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return res;
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Block evaluate_block{res};
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for (const auto & column : column_defaults)
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evaluate_block.erase(column.first);
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evaluateMissingDefaultsUnsafe(evaluate_block, header.getNamesAndTypesList(), column_defaults, context);
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ColumnsWithTypeAndName mixed_columns;
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mixed_columns.reserve(std::min(column_defaults.size(), delayed_defaults.size()));
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for (const ColumnWithTypeAndName & column_def : evaluate_block)
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{
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const String & column_name = column_def.name;
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if (column_defaults.count(column_name) == 0)
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continue;
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size_t block_column_position = res.getPositionByName(column_name);
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const ColumnWithTypeAndName & column_read = res.getByPosition(block_column_position);
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if (column_read.column->size() != column_def.column->size())
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throw Exception("Mismach column sizes while adding defaults", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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const BlockDelayedDefaults::BitMask & mask = delayed_defaults.getColumnBitmask(block_column_position);
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MutableColumnPtr column_mixed = column_read.column->cloneEmpty();
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for (size_t row_idx = 0; row_idx < column_read.column->size(); ++row_idx)
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{
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if (mask[row_idx])
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{
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if (column_def.column->isColumnConst())
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column_mixed->insert((*column_def.column)[row_idx]);
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else
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column_mixed->insertFrom(*column_def.column, row_idx);
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}
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else
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column_mixed->insertFrom(*column_read.column, row_idx);
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}
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ColumnWithTypeAndName mix = column_read.cloneEmpty();
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mix.column = std::move(column_mixed);
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mixed_columns.emplace_back(std::move(mix));
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}
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for (auto & column : mixed_columns)
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{
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res.erase(column.name);
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res.insert(std::move(column));
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}
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return res;
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}
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}
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