1 | #pragma once |
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2 | |
3 | #include <Parsers/IParserBase.h> |
4 | |
5 | |
6 | namespace DB |
7 | { |
8 | |
9 | /** Sampling factor of the form 0.1 or 1/10. |
10 | * It is parsed as a rational number without conversion to IEEE-754. |
11 | */ |
12 | class ParserSampleRatio : public IParserBase |
13 | { |
14 | protected: |
15 | const char * getName() const { return "Sample ratio or offset"; } |
16 | bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected); |
17 | }; |
18 | |
19 | } |
20 |