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83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
#pragma once
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#include <vector>
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#include <Core/Names.h>
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#include <Interpreters/DatabaseAndTableWithAlias.h>
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#include <Interpreters/InDepthNodeVisitor.h>
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namespace DB
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{
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class ASTIdentifier;
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class ASTQualifiedAsterisk;
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struct ASTTableJoin;
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class ASTSelectQuery;
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class ASTExpressionList;
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class ASTFunction;
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/// Visit one node for names qualification. @sa InDepthNodeVisitor.
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class TranslateQualifiedNamesMatcher
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{
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public:
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using Visitor = InDepthNodeVisitor<TranslateQualifiedNamesMatcher, true>;
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struct Data
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{
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const NameSet source_columns;
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const std::vector<TableWithColumnNames> & tables;
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std::unordered_set<String> join_using_columns;
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bool has_columns;
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Data(const NameSet & source_columns_, const std::vector<TableWithColumnNames> & tables_, bool has_columns_ = true)
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: source_columns(source_columns_)
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, tables(tables_)
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, has_columns(has_columns_)
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{}
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bool hasColumn(const String & name) const { return source_columns.count(name); }
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bool hasTable() const { return !tables.empty(); }
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bool processAsterisks() const { return hasTable() && has_columns; }
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bool unknownColumn(size_t table_pos, const ASTIdentifier & identifier) const;
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};
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static void visit(ASTPtr & ast, Data & data);
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static bool needChildVisit(ASTPtr & node, const ASTPtr & child);
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private:
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static void visit(ASTIdentifier & identifier, ASTPtr & ast, Data &);
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static void visit(const ASTQualifiedAsterisk & node, const ASTPtr & ast, Data &);
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static void visit(ASTTableJoin & join, const ASTPtr & ast, Data &);
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static void visit(ASTSelectQuery & select, const ASTPtr & ast, Data &);
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static void visit(ASTExpressionList &, const ASTPtr &, Data &);
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static void visit(ASTFunction &, const ASTPtr &, Data &);
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static void extractJoinUsingColumns(const ASTPtr ast, Data & data);
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};
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/// Visits AST for names qualification.
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/// It finds columns and translate their names to the normal form. Expand asterisks and qualified asterisks with column names.
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using TranslateQualifiedNamesVisitor = TranslateQualifiedNamesMatcher::Visitor;
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/// Restore ASTIdentifiers to long form, change table name in case of distributed.
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struct RestoreQualifiedNamesMatcher
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{
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struct Data
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{
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DatabaseAndTableWithAlias distributed_table;
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DatabaseAndTableWithAlias remote_table;
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bool rename = false;
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void changeTable(ASTIdentifier & identifier) const;
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};
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static bool needChildVisit(ASTPtr & node, const ASTPtr & child);
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static void visit(ASTPtr & ast, Data & data);
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static void visit(ASTIdentifier & identifier, ASTPtr & ast, Data & data);
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};
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using RestoreQualifiedNamesVisitor = InDepthNodeVisitor<RestoreQualifiedNamesMatcher, true>;
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}
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