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#include <Planner/CollectColumnIdentifiers.h>
#include <Analyzer/InDepthQueryTreeVisitor.h>
#include <Analyzer/ColumnNode.h>
#include <Planner/PlannerContext.h>
namespace DB
{
namespace
{
class CollectTopLevelColumnIdentifiersVisitor : public ConstInDepthQueryTreeVisitor<CollectTopLevelColumnIdentifiersVisitor>
{
public:
explicit CollectTopLevelColumnIdentifiersVisitor(const PlannerContextPtr & planner_context_, ColumnIdentifierSet & used_identifiers_)
: used_identifiers(used_identifiers_)
, planner_context(planner_context_)
{}
static bool needChildVisit(const QueryTreeNodePtr &, const QueryTreeNodePtr & child)
{
auto child_node_type = child->getNodeType();
return child_node_type != QueryTreeNodeType::TABLE
&& child_node_type != QueryTreeNodeType::TABLE_FUNCTION
&& child_node_type != QueryTreeNodeType::QUERY
&& child_node_type != QueryTreeNodeType::UNION
&& child_node_type != QueryTreeNodeType::JOIN
&& child_node_type != QueryTreeNodeType::ARRAY_JOIN;
}
void visitImpl(const QueryTreeNodePtr & node)
{
if (node->getNodeType() != QueryTreeNodeType::COLUMN)
return;
const auto * column_identifier = planner_context->getColumnNodeIdentifierOrNull(node);
if (!column_identifier)
return;
used_identifiers.insert(*column_identifier);
}
ColumnIdentifierSet & used_identifiers;
const PlannerContextPtr & planner_context;
};
}
void collectTopLevelColumnIdentifiers(const QueryTreeNodePtr & node, const PlannerContextPtr & planner_context, ColumnIdentifierSet & out)
{
CollectTopLevelColumnIdentifiersVisitor visitor(planner_context, out);
visitor.visit(node);
}
ColumnIdentifierSet collectTopLevelColumnIdentifiers(const QueryTreeNodePtr & node, const PlannerContextPtr & planner_context)
{
ColumnIdentifierSet out;
collectTopLevelColumnIdentifiers(node, planner_context, out);
return out;
}
}
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