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fixed reading const zero column in prewhere

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Nikolai Kochetov 2017-08-17 22:36:59 +03:00 committed by alexey-milovidov
parent 34dc2e5279
commit 850bc9f19d
1 changed files with 5 additions and 2 deletions
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7
dbms/src/Storages/MergeTree/MergeTreeBaseBlockInputStream.cpp
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@ -246,8 +246,11 @@ Block MergeTreeBaseBlockInputStream::readFromPart()
if (pre_range_reader)
{
/// Have to read rows from last partly read granula.
auto & range = ranges_to_read.back();
task->current_range_reader = reader->readRange(range.begin, range.end);
if (!ranges_to_read.empty())
{
auto & range = ranges_to_read.back();
task->current_range_reader = reader->readRange(range.begin, range.end);
}
/// But can just skip them.
task->number_of_rows_to_skip = rows_was_read_in_last_range;
}