blob: 7a0a0c304e2daab4698340a018e97bc87f72dc50 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
#pragma once
#include <base/types.h>
#include <Common/Stopwatch.h>
#include <vector>
namespace DB
{
class Block;
class ReadBuffer;
class WriteBuffer;
/// Information for profiling. See ISource.h
struct ProfileInfo
{
bool started = false;
Stopwatch total_stopwatch {CLOCK_MONOTONIC_COARSE}; /// Time with waiting time
size_t rows = 0;
size_t blocks = 0;
size_t bytes = 0;
using ProfileInfos = std::vector<const ProfileInfo *>;
/** Get the number of rows if there were no LIMIT.
* If there is no LIMIT, 0 is returned.
* If the query does not contain ORDER BY, the number can be underestimated - return the number of rows in blocks that were read before LIMIT reached.
* If the query contains an ORDER BY, then returns the exact number of rows as if LIMIT is removed from query.
*/
size_t getRowsBeforeLimit() const;
bool hasAppliedLimit() const;
void update(Block & block);
void update(size_t num_rows, size_t num_bytes);
/// Binary serialization and deserialization of main fields.
/// Writes only main fields i.e. fields that required by internal transmission protocol.
void read(ReadBuffer & in);
void write(WriteBuffer & out) const;
/// Sets main fields from other object (see methods above).
/// If skip_block_size_info if true, then rows, bytes and block fields are ignored.
void setFrom(const ProfileInfo & rhs, bool skip_block_size_info);
/// Only for Processors.
void setRowsBeforeLimit(size_t rows_before_limit_)
{
applied_limit = true;
rows_before_limit = rows_before_limit_;
}
private:
/// For these fields we make accessors, because they must be calculated beforehand.
mutable bool applied_limit = false; /// Whether LIMIT was applied
mutable size_t rows_before_limit = 0;
mutable bool calculated_rows_before_limit = false; /// Whether the field rows_before_limit was calculated
};
}
|
