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#pragma once
#include <Interpreters/InDepthNodeVisitor.h>
#include <Interpreters/Aliases.h>
namespace DB
{
class ASTSelectQuery;
struct TableWithColumnNamesAndTypes;
/// AST transformer. It replaces cross joins with equivalented inner join if possible.
class CrossToInnerJoinMatcher
{
public:
struct Data
{
const std::vector<TableWithColumnNamesAndTypes> & tables_with_columns;
const Aliases & aliases;
const String current_database;
UInt8 cross_to_inner_join_rewrite = 1;
};
static bool needChildVisit(ASTPtr &, const ASTPtr &);
static void visit(ASTPtr & ast, Data & data);
private:
static void visit(ASTSelectQuery & select, ASTPtr & ast, Data & data);
};
using CrossToInnerJoinVisitor = InDepthNodeVisitor<CrossToInnerJoinMatcher, true>;
}
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