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#pragma once
#include <Interpreters/InDepthNodeVisitor.h>
#include <Parsers/IAST.h>
namespace DB
{
class ASTSelectQuery;
/// Erases unnecessary ORDER BY from subquery
class DuplicateOrderByFromSubqueriesData
{
public:
using TypeToVisit = ASTSelectQuery;
bool done = false;
void visit(ASTSelectQuery & select_query, ASTPtr &);
};
using DuplicateOrderByFromSubqueriesMatcher = OneTypeMatcher<DuplicateOrderByFromSubqueriesData>;
using DuplicateOrderByFromSubqueriesVisitor = InDepthNodeVisitor<DuplicateOrderByFromSubqueriesMatcher, true>;
/// Finds SELECT that can be optimized
class DuplicateOrderByData
{
public:
using TypeToVisit = ASTSelectQuery;
ContextPtr context;
void visit(ASTSelectQuery & select_query, ASTPtr &);
};
using DuplicateOrderByMatcher = OneTypeMatcher<DuplicateOrderByData>;
using DuplicateOrderByVisitor = InDepthNodeVisitor<DuplicateOrderByMatcher, true>;
}
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