ClickHouse/dbms/src/Interpreters/DatabaseAndTableWithAlias.h

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