mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-30 05:30:51 +00:00
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
#pragma once
|
|
|
|
#include <Parsers/IAST.h>
|
|
|
|
|
|
namespace re2
|
|
{
|
|
class RE2;
|
|
}
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class WriteBuffer;
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
}
|
|
|
|
struct AsteriskSemantic;
|
|
struct AsteriskSemanticImpl;
|
|
|
|
|
|
/** SELECT COLUMNS('regexp') is expanded to multiple columns like * (asterisk).
|
|
* Optional transformers can be attached to further manipulate these expanded columns.
|
|
*/
|
|
class ASTColumnsMatcher : public IAST
|
|
{
|
|
public:
|
|
String getID(char) const override { return "ColumnsMatcher"; }
|
|
ASTPtr clone() const override;
|
|
|
|
void appendColumnName(WriteBuffer & ostr) const override;
|
|
void setPattern(String pattern);
|
|
bool isColumnMatching(const String & column_name) const;
|
|
void updateTreeHashImpl(SipHash & hash_state) const override;
|
|
|
|
ASTPtr column_list;
|
|
|
|
protected:
|
|
void formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const override;
|
|
|
|
private:
|
|
std::shared_ptr<re2::RE2> column_matcher;
|
|
String original_pattern;
|
|
std::shared_ptr<AsteriskSemanticImpl> semantic; /// pimpl
|
|
|
|
friend struct AsteriskSemantic;
|
|
};
|
|
|
|
|
|
}
|