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24 lines
905 B
C++
24 lines
905 B
C++
#pragma once
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#include <Analyzer/IQueryTreeNode.h>
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#include <Planner/Planner.h>
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#include <Planner/TableExpressionData.h>
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namespace DB
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{
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/** Collect all top level column identifiers from query tree node.
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* 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.
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* For example, in the following query:
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* 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
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* The top level column identifiers are: `t1.b`, `t2.y`
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*
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* There is precondition that table expression data is collected in planner context.
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*/
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ColumnIdentifierSet collectTopLevelColumnIdentifiers(const QueryTreeNodePtr & node, const PlannerContextPtr & planner_context);
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void collectTopLevelColumnIdentifiers(const QueryTreeNodePtr & node, const PlannerContextPtr & planner_context, ColumnIdentifierSet & out);
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}
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