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#pragma once
#include <Parsers/ASTQueryWithOutput.h>
#include <Parsers/SelectUnionMode.h>
namespace DB
{
/** Single SELECT query or multiple SELECT queries with UNION
* or UNION or UNION DISTINCT
*/
class ASTSelectWithUnionQuery : public ASTQueryWithOutput
{
public:
String getID(char) const override { return "SelectWithUnionQuery"; }
ASTPtr clone() const override;
void formatQueryImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
QueryKind getQueryKind() const override { return QueryKind::Select; }
SelectUnionMode union_mode;
SelectUnionModes list_of_modes;
bool is_normalized = false;
ASTPtr list_of_selects;
SelectUnionModesSet set_of_modes;
/// Consider any mode other than ALL as non-default.
bool hasNonDefaultUnionMode() const;
bool hasQueryParameters() const;
private:
/// This variable is optional as we want to set it on the first call to hasQueryParameters
/// and return the same variable on future calls to hasQueryParameters
/// its mutable as we set it in const function
mutable std::optional<bool> has_query_parameters;
};
}
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