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109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
#pragma once
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#include <optional>
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#include <Core/NamesAndTypes.h>
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#include <Storages/ColumnsDescription.h>
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#include <Storages/IStorage_fwd.h>
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#include <Storages/IndicesDescription.h>
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namespace DB
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{
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class ASTAlterCommand;
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/// Operation from the ALTER query (except for manipulation with PART/PARTITION).
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/// Adding Nested columns is not expanded to add individual columns.
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struct AlterCommand
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{
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enum Type
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{
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ADD_COLUMN,
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DROP_COLUMN,
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MODIFY_COLUMN,
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COMMENT_COLUMN,
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MODIFY_ORDER_BY,
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ADD_INDEX,
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DROP_INDEX,
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MODIFY_TTL,
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UKNOWN_TYPE,
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};
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Type type = UKNOWN_TYPE;
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String column_name;
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/// For DROP COLUMN ... FROM PARTITION
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String partition_name;
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/// For ADD and MODIFY, a new column type.
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DataTypePtr data_type;
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ColumnDefaultKind default_kind{};
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ASTPtr default_expression{};
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String comment;
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/// For ADD - after which column to add a new one. If an empty string, add to the end. To add to the beginning now it is impossible.
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String after_column;
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/// For DROP_COLUMN, MODIFY_COLUMN, COMMENT_COLUMN
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bool if_exists = false;
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/// For ADD_COLUMN
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bool if_not_exists = false;
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/// For MODIFY_ORDER_BY
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ASTPtr order_by;
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/// For ADD INDEX
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ASTPtr index_decl;
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String after_index_name;
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/// For ADD/DROP INDEX
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String index_name;
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/// For MODIFY TTL
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ASTPtr ttl;
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/// indicates that this command should not be applied, for example in case of if_exists=true and column doesn't exist.
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bool ignore = false;
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/// For ADD and MODIFY
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CompressionCodecPtr codec;
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AlterCommand() = default;
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AlterCommand(const Type type, const String & column_name, const DataTypePtr & data_type,
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const ColumnDefaultKind default_kind, const ASTPtr & default_expression,
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const String & after_column, const String & comment,
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const bool if_exists, const bool if_not_exists)
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: type{type}, column_name{column_name}, data_type{data_type}, default_kind{default_kind},
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default_expression{default_expression}, comment(comment), after_column{after_column},
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if_exists(if_exists), if_not_exists(if_not_exists)
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{}
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static std::optional<AlterCommand> parse(const ASTAlterCommand * command);
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void apply(ColumnsDescription & columns_description, IndicesDescription & indices_description,
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ASTPtr & order_by_ast, ASTPtr & primary_key_ast, ASTPtr & ttl_table_ast) const;
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/// Checks that not only metadata touched by that command
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bool isMutable() const;
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};
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class Context;
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class AlterCommands : public std::vector<AlterCommand>
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{
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public:
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void apply(ColumnsDescription & columns_description, IndicesDescription & indices_description, ASTPtr & order_by_ast,
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ASTPtr & primary_key_ast, ASTPtr & ttl_table_ast) const;
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/// For storages that don't support MODIFY_ORDER_BY.
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void apply(ColumnsDescription & columns_description) const;
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void validate(const IStorage & table, const Context & context);
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bool isMutable() const;
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};
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}
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