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
|
#include "readInvalidateQuery.h"
#include <QueryPipeline/QueryPipelineBuilder.h>
#include <Processors/Executors/PullingPipelineExecutor.h>
#include <IO/WriteBufferFromString.h>
#include <Formats/FormatSettings.h>
namespace DB
{
namespace ErrorCodes
{
extern const int TOO_MANY_COLUMNS;
extern const int TOO_MANY_ROWS;
extern const int RECEIVED_EMPTY_DATA;
}
std::string readInvalidateQuery(QueryPipeline pipeline)
{
PullingPipelineExecutor executor(pipeline);
Block block;
while (executor.pull(block))
if (block)
break;
if (!block)
throw Exception(ErrorCodes::RECEIVED_EMPTY_DATA, "Empty response");
auto columns = block.columns();
if (columns > 1)
throw Exception(ErrorCodes::TOO_MANY_COLUMNS, "Expected single column in resultset, got {}", std::to_string(columns));
auto rows = block.rows();
if (rows == 0)
throw Exception(ErrorCodes::RECEIVED_EMPTY_DATA, "Expected single row in resultset, got 0");
if (rows > 1)
throw Exception(ErrorCodes::TOO_MANY_ROWS, "Expected single row in resultset, got at least {}", rows);
WriteBufferFromOwnString out;
auto & column_type = block.getByPosition(0);
column_type.type->getDefaultSerialization()->serializeTextQuoted(*column_type.column->convertToFullColumnIfConst(), 0, out, FormatSettings());
while (executor.pull(block))
if (block.rows() > 0)
throw Exception(ErrorCodes::TOO_MANY_ROWS, "Expected single row in resultset, got at least {}", rows + 1);
return out.str();
}
}
|
