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#pragma once
#include <unordered_set>
#include <Interpreters/InDepthNodeVisitor.h>
#include <Parsers/IAST_fwd.h>
#include <Core/Settings.h>
namespace DB
{
class ASTFunction;
class ASTSelectWithUnionQuery;
class NormalizeSelectWithUnionQueryMatcher
{
public:
struct Data
{
const SetOperationMode union_default_mode;
};
static void getSelectsFromUnionListNode(ASTPtr ast_select, ASTs & selects);
static void visit(ASTPtr & ast, Data &);
static void visit(ASTSelectWithUnionQuery &, Data &);
static bool needChildVisit(const ASTPtr &, const ASTPtr &) { return true; }
};
/// We need normalize children first, so we should visit AST tree bottom up
using NormalizeSelectWithUnionQueryVisitor
= InDepthNodeVisitor<NormalizeSelectWithUnionQueryMatcher, false>;
}
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