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46 lines
2.3 KiB
C++
46 lines
2.3 KiB
C++
#pragma once
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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 need_long_name = false;/// if column presents in multiple tables we need qualified names
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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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size_t membership = 0; /// table position in join (starting from 1) detected by qualifier or 0 if not detected.
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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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/// @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 std::pair<String, String> extractDatabaseAndTable(const ASTIdentifier & identifier);
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static size_t canReferColumnToTable(const ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
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static String columnNormalName(const ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
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static String columnLongName(const ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
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static void setColumnNormalName(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 void setNeedLongName(ASTIdentifier & identifier, bool); /// if set setColumnNormalName makes qualified name
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static bool canBeAlias(const ASTIdentifier & identifier);
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static void setMembership(ASTIdentifier & identifier, size_t table_no);
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static size_t getMembership(const ASTIdentifier & identifier);
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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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static void setColumnShortName(ASTIdentifier & identifier, size_t match);
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};
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}
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