ClickHouse/dbms/include/DB/Interpreters/InterpreterShowProcesslistQuery.h

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#pragma once
#include <DB/IO/ReadBufferFromString.h>
#include <DB/Storages/StorageSystemProcesses.h>
#include <DB/Interpreters/executeQuery.h>
#include <DB/Parsers/ASTQueryWithOutput.h>
#include <DB/Parsers/ASTIdentifier.h>
namespace DB
{
/** Вернуть список запросов, исполняющихся прямо сейчас.
*/
class InterpreterShowProcesslistQuery
{
public:
InterpreterShowProcesslistQuery(ASTPtr query_ptr_, Context & context_)
: query_ptr(query_ptr_), context(context_) {}
BlockIO execute()
{
return executeQuery(getRewrittenQuery(), context, true);
}
BlockInputStreamPtr executeAndFormat(WriteBuffer & buf)
{
String query = getRewrittenQuery();
ReadBufferFromString in(query);
BlockInputStreamPtr query_plan;
executeQuery(in, buf, context, query_plan, true);
return query_plan;
}
private:
ASTPtr query_ptr;
Context context;
String getRewrittenQuery()
{
const ASTQueryWithOutput & query = dynamic_cast<const ASTQueryWithOutput &>(*query_ptr);
std::stringstream rewritten_query;
rewritten_query << "SELECT * FROM system.processes";
if (query.format)
rewritten_query << " FORMAT " << dynamic_cast<const ASTIdentifier &>(*query.format).name;
return rewritten_query.str();
}
};
}