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#pragma once
#include <Analyzer/IQueryTreeNode.h>
#include <Planner/Planner.h>
#include <Planner/TableExpressionData.h>
namespace DB
{
/** Collect all top level column identifiers from query tree node.
* Top level column identifiers are in the SELECT list or GROUP BY/ORDER BY/WHERE/HAVING clause, but not in child nodes of join tree.
* For example, in the following query:
* SELECT sum(b) FROM (SELECT x AS a, y AS b FROM t) AS t1 JOIN t2 ON t1.a = t2.key GROUP BY t2.y
* The top level column identifiers are: `t1.b`, `t2.y`
*
* There is precondition that table expression data is collected in planner context.
*/
ColumnIdentifierSet collectTopLevelColumnIdentifiers(const QueryTreeNodePtr & node, const PlannerContextPtr & planner_context);
void collectTopLevelColumnIdentifiers(const QueryTreeNodePtr & node, const PlannerContextPtr & planner_context, ColumnIdentifierSet & out);
}
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