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#pragma once
#include <Parsers/IAST.h>
namespace DB
{
/** Something like t.*
* It will have qualifier as its child ASTIdentifier.
* Optional transformers can be attached to further manipulate these expanded columns.
*/
class ASTQualifiedAsterisk : public IAST
{
public:
String getID(char) const override { return "QualifiedAsterisk"; }
ASTPtr clone() const override
{
auto clone = std::make_shared<ASTQualifiedAsterisk>(*this);
clone->children.clear();
if (transformers)
{
clone->transformers = transformers->clone();
clone->children.push_back(clone->transformers);
}
clone->qualifier = qualifier->clone();
clone->children.push_back(clone->qualifier);
return clone;
}
void appendColumnName(WriteBuffer & ostr) const override;
ASTPtr qualifier;
ASTPtr transformers;
protected:
void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
};
}
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