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84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
#pragma once
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#include <Core/Block.h>
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#include <Interpreters/IJoin.h>
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#include <Interpreters/ActionsDAG.h>
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#include <Interpreters/ExpressionActions.h>
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namespace DB
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{
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struct ColumnWithTypeAndName;
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class TableJoin;
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class IColumn;
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using ColumnRawPtrs = std::vector<const IColumn *>;
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namespace JoinCommon
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{
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bool canBecomeNullable(const DataTypePtr & type);
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DataTypePtr convertTypeToNullable(const DataTypePtr & type);
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void convertColumnToNullable(ColumnWithTypeAndName & column, bool remove_low_card = false);
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void convertColumnsToNullable(Block & block, size_t starting_pos = 0);
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void removeColumnNullability(ColumnWithTypeAndName & column);
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void changeColumnRepresentation(const ColumnPtr & src_column, ColumnPtr & dst_column);
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ColumnPtr emptyNotNullableClone(const ColumnPtr & column);
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Columns materializeColumns(const Block & block, const Names & names);
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ColumnRawPtrs materializeColumnsInplace(Block & block, const Names & names);
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ColumnRawPtrs getRawPointers(const Columns & columns);
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void removeLowCardinalityInplace(Block & block);
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void removeLowCardinalityInplace(Block & block, const Names & names, bool change_type = true);
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void restoreLowCardinalityInplace(Block & block);
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ColumnRawPtrs extractKeysForJoin(const Block & block_keys, const Names & key_names_right);
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/// Throw an exception if blocks have different types of key columns. Compare up to Nullability.
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void checkTypesOfKeys(const Block & block_left, const Names & key_names_left, const Block & block_right, const Names & key_names_right);
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void createMissedColumns(Block & block);
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void joinTotals(const Block & totals, const Block & columns_to_add, const TableJoin & table_join, Block & block);
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void addDefaultValues(IColumn & column, const DataTypePtr & type, size_t count);
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bool typesEqualUpToNullability(DataTypePtr left_type, DataTypePtr right_type);
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void changeLowCardinalityInplace(ColumnWithTypeAndName & column);
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}
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/// Creates result from right table data in RIGHT and FULL JOIN when keys are not present in left table.
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class NotJoined
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{
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public:
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NotJoined(const TableJoin & table_join, const Block & saved_block_sample_, const Block & right_sample_block,
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const Block & result_sample_block_);
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void correctLowcardAndNullability(MutableColumns & columns_right);
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void addLeftColumns(Block & block, size_t rows_added) const;
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void addRightColumns(Block & block, MutableColumns & columns_right) const;
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void copySameKeys(Block & block) const;
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protected:
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Block saved_block_sample;
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Block result_sample_block;
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~NotJoined() = default;
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private:
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/// Indices of columns in result_sample_block that should be generated
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std::vector<size_t> column_indices_left;
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/// Indices of columns that come from the right-side table: right_pos -> result_pos
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std::unordered_map<size_t, size_t> column_indices_right;
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///
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std::unordered_map<size_t, size_t> same_result_keys;
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/// Which right columns (saved in parent) need nullability change before placing them in result block
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std::vector<size_t> right_nullability_adds;
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std::vector<size_t> right_nullability_removes;
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/// Which right columns (saved in parent) need LowCardinality change before placing them in result block
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std::vector<std::pair<size_t, ColumnPtr>> right_lowcard_changes;
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void setRightIndex(size_t right_pos, size_t result_position);
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void extractColumnChanges(size_t right_pos, size_t result_pos);
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};
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}
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