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47 lines
1.8 KiB
C++
47 lines
1.8 KiB
C++
#pragma once
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#include <Storages/ColumnsDescription.h>
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#include <Storages/IndicesDescription.h>
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#include <Storages/ConstraintsDescription.h>
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#include <Parsers/IAST_fwd.h>
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namespace DB
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{
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/// Structure represent table metadata stored in memory.
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/// Only one storage engine support all fields -- MergeTree.
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/// Complete table AST can be recreated from this struct.
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struct StorageInMemoryMetadata
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{
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/// Columns of table with their names, types,
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/// defaults, comments, etc. All table engines have columns.
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ColumnsDescription columns;
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/// Table indices. Currently supported for MergeTree only.
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IndicesDescription indices;
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/// Table constraints. Currently supported for MergeTree only.
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ConstraintsDescription constraints;
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/// PARTITION BY expression. Currently supported for MergeTree only.
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ASTPtr partition_by_ast = nullptr;
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/// ORDER BY expression. Required field for all MergeTree tables
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/// even in old syntax MergeTree(partition_key, order_by, ...)
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ASTPtr order_by_ast = nullptr;
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/// PRIMARY KEY expression. If absent, than equal to order_by_ast.
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ASTPtr primary_key_ast = nullptr;
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/// TTL expression for whole table. Supported for MergeTree only.
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ASTPtr ttl_for_table_ast = nullptr;
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/// SAMPLE BY expression. Supported for MergeTree only.
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ASTPtr sample_by_ast = nullptr;
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/// SETTINGS expression. Supported for MergeTree, Buffer and Kafka.
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ASTPtr settings_ast = nullptr;
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/// SELECT QUERY. Supported for MaterializedView only.
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ASTPtr select = nullptr;
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StorageInMemoryMetadata(const StorageInMemoryMetadata & other);
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StorageInMemoryMetadata() = default;
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StorageInMemoryMetadata(const ColumnsDescription & columns_, const IndicesDescription & indices_, const ConstraintsDescription & constraints_);
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StorageInMemoryMetadata & operator=(const StorageInMemoryMetadata & other);
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};
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}
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