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110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
#include <Interpreters/DatabaseAndTableWithAlias.h>
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#include <Interpreters/IdentifierSemantic.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/getTableExpressions.h>
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#include <Common/typeid_cast.h>
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#include <Parsers/IAST.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Parsers/ASTSelectQuery.h>
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#include <Parsers/ASTSubquery.h>
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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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DatabaseAndTableWithAlias::DatabaseAndTableWithAlias(const ASTTableIdentifier & identifier, const String & current_database)
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{
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alias = identifier.tryGetAlias();
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auto table_id = identifier.getTableId();
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std::tie(database, table, uuid) = std::tie(table_id.database_name, table_id.table_name, table_id.uuid);
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if (database.empty())
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database = current_database;
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}
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DatabaseAndTableWithAlias::DatabaseAndTableWithAlias(const ASTPtr & node, const String & current_database)
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{
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const auto * identifier = node->as<ASTTableIdentifier>();
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if (!identifier)
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throw Exception("Logical error: table identifier expected", ErrorCodes::LOGICAL_ERROR);
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*this = DatabaseAndTableWithAlias(*identifier, current_database);
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}
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DatabaseAndTableWithAlias::DatabaseAndTableWithAlias(const ASTTableExpression & table_expression, const String & current_database)
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{
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if (table_expression.database_and_table_name)
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*this = DatabaseAndTableWithAlias(table_expression.database_and_table_name, current_database);
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else if (table_expression.table_function)
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alias = table_expression.table_function->tryGetAlias();
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else if (table_expression.subquery)
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{
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const auto & cte_name = table_expression.subquery->as<const ASTSubquery &>().cte_name;
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if (!cte_name.empty())
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{
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database = current_database;
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table = cte_name;
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}
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alias = table_expression.subquery->tryGetAlias();
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}
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else
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throw Exception("Logical error: no known elements in ASTTableExpression", ErrorCodes::LOGICAL_ERROR);
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}
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bool DatabaseAndTableWithAlias::satisfies(const DatabaseAndTableWithAlias & db_table, bool table_may_be_an_alias) const
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{
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/// table.*, alias.* or database.table.*
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if (database.empty())
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{
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if (!db_table.table.empty() && table == db_table.table)
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return true;
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if (!db_table.alias.empty())
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return (alias == db_table.alias) || (table_may_be_an_alias && table == db_table.alias);
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}
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return database == db_table.database && table == db_table.table;
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}
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String DatabaseAndTableWithAlias::getQualifiedNamePrefix(bool with_dot) const
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{
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if (alias.empty() && table.empty())
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return "";
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return (!alias.empty() ? alias : table) + (with_dot ? "." : "");
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}
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std::vector<DatabaseAndTableWithAlias> getDatabaseAndTables(const ASTSelectQuery & select_query, const String & current_database)
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{
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std::vector<const ASTTableExpression *> tables_expression = getTableExpressions(select_query);
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std::vector<DatabaseAndTableWithAlias> database_and_table_with_aliases;
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database_and_table_with_aliases.reserve(tables_expression.size());
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for (const auto & table_expression : tables_expression)
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database_and_table_with_aliases.emplace_back(DatabaseAndTableWithAlias(*table_expression, current_database));
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return database_and_table_with_aliases;
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}
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std::optional<DatabaseAndTableWithAlias> getDatabaseAndTable(const ASTSelectQuery & select, size_t table_number)
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{
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const ASTTableExpression * table_expression = getTableExpression(select, table_number);
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if (!table_expression)
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return {};
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ASTPtr database_and_table_name = table_expression->database_and_table_name;
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if (!database_and_table_name || !database_and_table_name->as<ASTTableIdentifier>())
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return {};
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return DatabaseAndTableWithAlias(database_and_table_name);
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}
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}
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