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#pragma once
#include <Analyzer/IQueryTreePass.h>
namespace DB
{
/** Resolve GROUPING functions in query node.
* GROUPING function is replaced with specialized GROUPING function based on GROUP BY modifiers.
* For ROLLUP, CUBE, GROUPING SETS specialized GROUPING function take special __grouping_set column as argument
* and previous GROUPING function arguments.
*
* Example: SELECT grouping(id) FROM test_table GROUP BY id;
* Result: SELECT groupingOrdinary(id) FROM test_table GROUP BY id;
*
* Example: SELECT grouping(id), grouping(value) FROM test_table GROUP BY GROUPING SETS ((id), (value));
* Result: SELECT groupingForGroupingSets(__grouping_set, id), groupingForGroupingSets(__grouping_set, value)
* FROM test_table GROUP BY GROUPING SETS ((id), (value));
*/
class GroupingFunctionsResolvePass final : public IQueryTreePass
{
public:
String getName() override { return "GroupingFunctionsResolvePass"; }
String getDescription() override { return "Resolve GROUPING functions based on GROUP BY modifiers"; }
void run(QueryTreeNodePtr query_tree_node, ContextPtr context) override;
};
}
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