mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-19 12:52:37 +00:00
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
#pragma once
|
|
|
|
#include <Core/Field.h>
|
|
#include <Parsers/ASTWithAlias.h>
|
|
#include <Parsers/TokenIterator.h>
|
|
#include <Common/FieldVisitorDump.h>
|
|
#include <DataTypes/IDataType.h>
|
|
|
|
#include <optional>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/// Literal (atomic) - number, string, NULL
|
|
class ASTLiteral : public ASTWithAlias
|
|
{
|
|
public:
|
|
explicit ASTLiteral(Field value_) : value(std::move(value_)) {}
|
|
|
|
// This methond and the custom_type are only used for Apache Gluten,
|
|
explicit ASTLiteral(Field value_, DataTypePtr & type_) : value(std::move(value_))
|
|
{
|
|
custom_type = type_;
|
|
}
|
|
|
|
Field value;
|
|
DataTypePtr custom_type;
|
|
|
|
/// For ConstantExpressionTemplate
|
|
std::optional<TokenIterator> begin;
|
|
std::optional<TokenIterator> end;
|
|
|
|
/*
|
|
* The name of the column corresponding to this literal. Only used to
|
|
* disambiguate the literal columns with the same display name that are
|
|
* created at the expression analyzer stage. In the future, we might want to
|
|
* have a full separation between display names and column identifiers. For
|
|
* now, this field is effectively just some private EA data.
|
|
*/
|
|
String unique_column_name;
|
|
|
|
/// For compatibility reasons in distributed queries,
|
|
/// we may need to use legacy column name for tuple literal.
|
|
bool use_legacy_column_name_of_tuple = false;
|
|
|
|
/** Get the text that identifies this element. */
|
|
String getID(char delim) const override { return "Literal" + (delim + applyVisitor(FieldVisitorDump(), value)); }
|
|
|
|
ASTPtr clone() const override;
|
|
|
|
void updateTreeHashImpl(SipHash & hash_state, bool ignore_aliases) const override;
|
|
|
|
protected:
|
|
void formatImplWithoutAlias(const FormatSettings & settings, FormatState &, FormatStateStacked) const override;
|
|
|
|
void appendColumnNameImpl(WriteBuffer & ostr) const override;
|
|
|
|
private:
|
|
/// Legacy version of 'appendColumnNameImpl'. It differs only with tuple literals.
|
|
/// It's only needed to continue working of queries with tuple literals
|
|
/// in distributed tables while rolling update.
|
|
void appendColumnNameImplLegacy(WriteBuffer & ostr) const;
|
|
};
|
|
|
|
}
|