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118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
#pragma once
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#include <Core/NamesAndTypes.h>
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#include <Core/Names.h>
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#include <Core/Block.h>
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#include <Common/Exception.h>
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#include <Storages/ColumnDefault.h>
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#include <Storages/ColumnCodec.h>
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#include <optional>
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#include <boost/multi_index_container.hpp>
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#include <boost/multi_index/sequenced_index.hpp>
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#include <boost/multi_index/ordered_index.hpp>
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#include <boost/multi_index/member.hpp>
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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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/// Description of a single table column (in CREATE TABLE for example).
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struct ColumnDescription
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{
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String name;
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DataTypePtr type;
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ColumnDefault default_desc;
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String comment;
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CompressionCodecPtr codec;
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ASTPtr ttl;
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bool is_virtual = false;
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ColumnDescription() = default;
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ColumnDescription(String name_, DataTypePtr type_, bool is_virtual_);
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bool operator==(const ColumnDescription & other) const;
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bool operator!=(const ColumnDescription & other) const { return !(*this == other); }
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void writeText(WriteBuffer & buf) const;
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void readText(ReadBuffer & buf);
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};
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/// Description of multiple table columns (in CREATE TABLE for example).
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class ColumnsDescription
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{
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public:
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ColumnsDescription() = default;
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explicit ColumnsDescription(NamesAndTypesList ordinary_, bool all_virtuals = false);
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/// `after_column` can be a Nested column name;
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void add(ColumnDescription column, const String & after_column = String());
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/// `column_name` can be a Nested column name;
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void remove(const String & column_name);
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void flattenNested(); /// TODO: remove, insert already flattened Nested columns.
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bool operator==(const ColumnsDescription & other) const { return columns == other.columns; }
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bool operator!=(const ColumnsDescription & other) const { return !(*this == other); }
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auto begin() const { return columns.begin(); }
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auto end() const { return columns.end(); }
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NamesAndTypesList getOrdinary() const;
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NamesAndTypesList getMaterialized() const;
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NamesAndTypesList getAliases() const;
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NamesAndTypesList getVirtuals() const;
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NamesAndTypesList getAllPhysical() const; /// ordinary + materialized.
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NamesAndTypesList getAll() const; /// ordinary + materialized + aliases + virtuals.
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using ColumnTTLs = std::unordered_map<String, ASTPtr>;
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ColumnTTLs getColumnTTLs() const;
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bool has(const String & column_name) const;
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bool hasNested(const String & column_name) const;
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const ColumnDescription & get(const String & column_name) const;
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template <typename F>
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void modify(const String & column_name, F && f)
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{
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auto it = columns.get<1>().find(column_name);
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if (it == columns.get<1>().end())
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throw Exception("Cannot find column " + column_name + " in ColumnsDescription", ErrorCodes::LOGICAL_ERROR);
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if (!columns.get<1>().modify(it, std::forward<F>(f)))
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throw Exception("Cannot modify ColumnDescription for column " + column_name + ": column name cannot be changed", ErrorCodes::LOGICAL_ERROR);
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}
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Names getNamesOfPhysical() const;
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bool hasPhysical(const String & column_name) const;
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NameAndTypePair getPhysical(const String & column_name) const;
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ColumnDefaults getDefaults() const; /// TODO: remove
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bool hasDefault(const String & column_name) const;
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std::optional<ColumnDefault> getDefault(const String & column_name) const;
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CompressionCodecPtr getCodecOrDefault(const String & column_name, CompressionCodecPtr default_codec) const;
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CompressionCodecPtr getCodecOrDefault(const String & column_name) const;
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String toString() const;
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static ColumnsDescription parse(const String & str);
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/// Keep the sequence of columns and allow to lookup by name.
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using Container = boost::multi_index_container<
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ColumnDescription,
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boost::multi_index::indexed_by<
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boost::multi_index::sequenced<>,
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boost::multi_index::ordered_unique<boost::multi_index::member<ColumnDescription, String, &ColumnDescription::name>>>>;
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private:
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Container columns;
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};
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}
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