mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
#pragma once
|
|
|
|
#include <vector>
|
|
|
|
#include <Core/Names.h>
|
|
#include <Interpreters/DatabaseAndTableWithAlias.h>
|
|
#include <Interpreters/InDepthNodeVisitor.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class ASTIdentifier;
|
|
class ASTQualifiedAsterisk;
|
|
struct ASTTableJoin;
|
|
class ASTSelectQuery;
|
|
class ASTExpressionList;
|
|
class ASTFunction;
|
|
|
|
/// Visit one node for names qualification. @sa InDepthNodeVisitor.
|
|
class TranslateQualifiedNamesMatcher
|
|
{
|
|
public:
|
|
using Visitor = InDepthNodeVisitor<TranslateQualifiedNamesMatcher, true>;
|
|
|
|
struct Data
|
|
{
|
|
const NameSet source_columns;
|
|
const std::vector<TableWithColumnNames> & tables;
|
|
std::unordered_set<String> join_using_columns;
|
|
bool has_columns;
|
|
|
|
Data(const NameSet & source_columns_, const std::vector<TableWithColumnNames> & tables_, bool has_columns_ = true)
|
|
: source_columns(source_columns_)
|
|
, tables(tables_)
|
|
, has_columns(has_columns_)
|
|
{}
|
|
|
|
static std::vector<TableWithColumnNames> tablesOnly(const std::vector<DatabaseAndTableWithAlias> & tables)
|
|
{
|
|
std::vector<TableWithColumnNames> tables_with_columns;
|
|
tables_with_columns.reserve(tables.size());
|
|
|
|
for (const auto & table : tables)
|
|
tables_with_columns.emplace_back(TableWithColumnNames{table, {}});
|
|
return tables_with_columns;
|
|
}
|
|
|
|
bool processAsterisks() const { return !tables.empty() && has_columns; }
|
|
};
|
|
|
|
static void visit(ASTPtr & ast, Data & data);
|
|
static bool needChildVisit(ASTPtr & node, const ASTPtr & child);
|
|
|
|
private:
|
|
static void visit(ASTIdentifier & node, ASTPtr & ast, Data &);
|
|
static void visit(const ASTQualifiedAsterisk & node, const ASTPtr & ast, Data &);
|
|
static void visit(ASTTableJoin & node, const ASTPtr & ast, Data &);
|
|
static void visit(ASTSelectQuery & node, const ASTPtr & ast, Data &);
|
|
static void visit(ASTExpressionList &, const ASTPtr &, Data &);
|
|
static void visit(ASTFunction &, const ASTPtr &, Data &);
|
|
|
|
static void extractJoinUsingColumns(const ASTPtr ast, Data & data);
|
|
};
|
|
|
|
/// Visits AST for names qualification.
|
|
/// It finds columns and translate their names to the normal form. Expand asterisks and qualified asterisks with column names.
|
|
using TranslateQualifiedNamesVisitor = TranslateQualifiedNamesMatcher::Visitor;
|
|
|
|
/// Restore ASTIdentifiers to long form
|
|
struct RestoreQualifiedNamesData
|
|
{
|
|
using TypeToVisit = ASTIdentifier;
|
|
|
|
void visit(ASTIdentifier & identifier, ASTPtr & ast);
|
|
};
|
|
|
|
using RestoreQualifiedNamesMatcher = OneTypeMatcher<RestoreQualifiedNamesData>;
|
|
using RestoreQualifiedNamesVisitor = InDepthNodeVisitor<RestoreQualifiedNamesMatcher, true>;
|
|
|
|
}
|