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clickhouse: fixed DISTINCT with ORDER BY and LIMIT. [#METR-9598]

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This commit is contained in:
Michael Kolupaev 2013-12-25 13:12:43 +00:00
parent 6bf937e897
commit 666ff5201f
1 changed files with 9 additions and 5 deletions
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14
dbms/src/Interpreters/InterpreterSelectQuery.cpp
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@ -596,11 +596,15 @@ void InterpreterSelectQuery::executeOrder(BlockInputStreams & streams)
order_descr.push_back(SortColumnDescription(name, dynamic_cast<ASTOrderByElement &>(**it).direction));
}
/// Если есть LIMIT - можно делать частичную сортировку.
size_t limit_length = 0;
size_t limit_offset = 0;
getLimitLengthAndOffset(query, limit_length, limit_offset);
size_t limit = limit_length + limit_offset;
/// Если есть LIMIT и нет DISTINCT - можно делать частичную сортировку.
size_t limit = 0;
if (!query.distinct)
{
size_t limit_length = 0;
size_t limit_offset = 0;
getLimitLengthAndOffset(query, limit_length, limit_offset);
limit = limit_length + limit_offset;
}
bool is_async = settings.asynchronous && streams.size() <= settings.max_threads;
for (BlockInputStreams::iterator it = streams.begin(); it != streams.end(); ++it)