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dbms: improved performance on short queries [#METR-11571].

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This commit is contained in:
Alexey Milovidov 2014-06-20 23:56:45 +04:00
parent 0a3be511e3
commit d420486522
2 changed files with 7 additions and 18 deletions
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2
dbms/include/DB/Core/Block.h
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@ -31,8 +31,6 @@ private:
IndexByPosition_t index_by_position;
IndexByName_t index_by_name;
void rebuildIndexByPosition();
public:
Block() {}

23
dbms/src/Core/Block.cpp
View File

@ -38,28 +38,19 @@ void Block::addDefaults(NamesAndTypesListPtr required_columns)
Block & Block::operator= (const Block & other)
{
data = other.data;
rebuildIndexByPosition();
index_by_name.clear();
for (IndexByName_t::const_iterator it = other.index_by_name.begin(); it != other.index_by_name.end(); ++it)
{
Container_t::iterator value = data.begin();
std::advance(value, std::distance(const_cast<Block&>(other).data.begin(), it->second));
index_by_name[it->first] = value;
}
return *this;
}
void Block::rebuildIndexByPosition()
{
index_by_position.resize(data.size());
index_by_name.clear();
size_t pos = 0;
for (Container_t::iterator it = data.begin(); it != data.end(); ++it, ++pos)
{
index_by_position[pos] = it;
}
index_by_name[it->name] = it;
}
return *this;
}
void Block::insert(size_t position, const ColumnWithNameAndType & elem)
{