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#pragma once
#include <Parsers/IAST.h>
#include <Interpreters/InDepthNodeVisitor.h>
namespace DB
{
class ASTSelectQuery;
/// Rewrite GROUPING SETS with only one group, to GROUP BY.
///
/// Examples:
/// - GROUPING SETS (foo) -> GROUP BY foo
/// - GROUPING SETS ((foo, bar)) -> GROUP BY foo, bar
///
/// But not the following:
/// - GROUPING SETS (foo, bar) (since it has two groups (foo) and (bar))
class GroupingSetsRewriterData
{
public:
using TypeToVisit = ASTSelectQuery;
static void visit(ASTSelectQuery & select_query, ASTPtr &);
};
using GroupingSetsRewriterMatcher = OneTypeMatcher<GroupingSetsRewriterData>;
using GroupingSetsRewriterVisitor = InDepthNodeVisitor<GroupingSetsRewriterMatcher, true>;
}
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