1 | #pragma once |
---|---|
2 | |
3 | #include <Core/Field.h> |
4 | #include <Common/FieldVisitors.h> |
5 | #include <Parsers/ASTWithAlias.h> |
6 | #include <Parsers/TokenIterator.h> |
7 | #include <optional> |
8 | |
9 | |
10 | namespace DB |
11 | { |
12 | |
13 | /** Literal (atomic) - number, string, NULL |
14 | */ |
15 | class ASTLiteral : public ASTWithAlias |
16 | { |
17 | public: |
18 | Field value; |
19 | |
20 | /// For ConstantExpressionTemplate |
21 | std::optional<TokenIterator> begin; |
22 | std::optional<TokenIterator> end; |
23 | |
24 | ASTLiteral(const Field & value_) : value(value_) {} |
25 | |
26 | /** Get the text that identifies this element. */ |
27 | String getID(char delim) const override { return "Literal"+ (delim + applyVisitor(FieldVisitorDump(), value)); } |
28 | |
29 | ASTPtr clone() const override { return std::make_shared<ASTLiteral>(*this); } |
30 | |
31 | void updateTreeHashImpl(SipHash & hash_state) const override; |
32 | |
33 | protected: |
34 | void formatImplWithoutAlias(const FormatSettings & settings, FormatState &, FormatStateStacked) const override |
35 | { |
36 | settings.ostr << applyVisitor(FieldVisitorToString(), value); |
37 | } |
38 | |
39 | void appendColumnNameImpl(WriteBuffer & ostr) const override; |
40 | }; |
41 | |
42 | } |
43 |