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67 lines
3.4 KiB
C++
67 lines
3.4 KiB
C++
#pragma once
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#include <optional>
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#include <Parsers/ASTIdentifier.h>
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#include <Interpreters/DatabaseAndTableWithAlias.h>
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namespace DB
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{
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struct IdentifierSemanticImpl
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{
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bool special = false; /// for now it's 'not a column': tables, subselects and some special stuff like FORMAT
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bool can_be_alias = true; /// if it's a cropped name it could not be an alias
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bool covered = false; /// real (compound) name is hidden by an alias (short name)
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std::optional<size_t> membership; /// table position in join
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};
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/// Static calss to manipulate IdentifierSemanticImpl via ASTIdentifier
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struct IdentifierSemantic
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{
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enum class ColumnMatch
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{
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NoMatch,
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ColumnName, /// column qualified with column names list
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AliasedTableName, /// column qualified with table name (but table has an alias so its priority is lower than TableName)
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TableName, /// column qualified with table name
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DbAndTable, /// column qualified with database and table name
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TableAlias, /// column qualified with table alias
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Ambiguous,
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};
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/// @returns name for column identifiers
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static std::optional<String> getColumnName(const ASTIdentifier & node);
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static std::optional<String> getColumnName(const ASTPtr & ast);
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/// @returns name for 'not a column' identifiers
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static std::optional<String> getTableName(const ASTIdentifier & node);
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static std::optional<String> getTableName(const ASTPtr & ast);
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static StorageID extractDatabaseAndTable(const ASTIdentifier & identifier);
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static std::optional<String> extractNestedName(const ASTIdentifier & identifier, const String & table_name);
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static ColumnMatch canReferColumnToTable(const ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
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static ColumnMatch canReferColumnToTable(const ASTIdentifier & identifier, const TableWithColumnNames & db_and_table);
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static ColumnMatch canReferColumnToTable(const ASTIdentifier & identifier, const TableWithColumnNamesAndTypes & db_and_table);
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static void setColumnShortName(ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
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static void setColumnLongName(ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
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static bool canBeAlias(const ASTIdentifier & identifier);
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static void setMembership(ASTIdentifier &, size_t table_pos);
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static void coverName(ASTIdentifier &, const String & alias);
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static std::optional<ASTIdentifier> uncover(const ASTIdentifier & identifier);
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static std::optional<size_t> getMembership(const ASTIdentifier & identifier);
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static std::optional<size_t> chooseTable(const ASTIdentifier &, const std::vector<DatabaseAndTableWithAlias> & tables,
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bool allow_ambiguous = false);
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static std::optional<size_t> chooseTable(const ASTIdentifier &, const std::vector<TableWithColumnNames> & tables,
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bool allow_ambiguous = false);
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static std::optional<size_t> chooseTable(const ASTIdentifier &, const std::vector<TableWithColumnNamesAndTypes> & tables,
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bool allow_ambiguous = false);
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private:
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static bool doesIdentifierBelongTo(const ASTIdentifier & identifier, const String & database, const String & table);
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static bool doesIdentifierBelongTo(const ASTIdentifier & identifier, const String & table);
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};
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}
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