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50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
#pragma once
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#include <Core/Names.h>
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#include <Core/Types.h>
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#include <Parsers/IAST_fwd.h>
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#include <memory>
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#include <optional>
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namespace DB
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{
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class ASTSelectQuery;
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class ASTIdentifier;
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struct ASTTableExpression;
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class Context;
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/// Extracts database name (and/or alias) from table expression or identifier
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struct DatabaseAndTableWithAlias
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{
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String database;
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String table;
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String alias;
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DatabaseAndTableWithAlias() = default;
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DatabaseAndTableWithAlias(const ASTPtr & identifier_node, const String & current_database = "");
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DatabaseAndTableWithAlias(const ASTIdentifier & identifier, const String & current_database = "");
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DatabaseAndTableWithAlias(const ASTTableExpression & table_expression, const String & current_database = "");
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/// "alias." or "table." if alias is empty
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String getQualifiedNamePrefix(bool with_dot = true) const;
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/// Check if it satisfies another db_table name. @note opterion is not symmetric.
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bool satisfies(const DatabaseAndTableWithAlias & table, bool table_may_be_an_alias);
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};
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using TableWithColumnNames = std::pair<DatabaseAndTableWithAlias, Names>;
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std::vector<DatabaseAndTableWithAlias> getDatabaseAndTables(const ASTSelectQuery & select_query, const String & current_database);
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std::optional<DatabaseAndTableWithAlias> getDatabaseAndTable(const ASTSelectQuery & select, size_t table_number);
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std::vector<TableWithColumnNames> getDatabaseAndTablesWithColumnNames(const ASTSelectQuery & select_query, const Context & context);
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std::vector<const ASTTableExpression *> getSelectTablesExpression(const ASTSelectQuery & select_query);
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ASTPtr extractTableExpression(const ASTSelectQuery & select, size_t table_number);
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}
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