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This commit is contained in:
Nikita Mikhaylov 2021-08-09 15:42:29 +00:00
parent 7803a27e99
commit 3d201c37c0
2 changed files with 15 additions and 0 deletions
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14
src/Core/Block.cpp
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@ -44,6 +44,13 @@ void Block::initializeIndexByName()
}
void Block::reserve(size_t count)
{
index_by_name.reserve(count);
data.reserve(count);
}
void Block::insert(size_t position, ColumnWithTypeAndName elem)
{
if (position > data.size())
@ -287,6 +294,7 @@ std::string Block::dumpIndex() const
Block Block::cloneEmpty() const
{
Block res;
res.reserve(data.size());
for (const auto & elem : data)
res.insert(elem.cloneEmpty());
@ -364,6 +372,8 @@ Block Block::cloneWithColumns(MutableColumns && columns) const
Block res;
size_t num_columns = data.size();
res.reserve(num_columns);
for (size_t i = 0; i < num_columns; ++i)
res.insert({ std::move(columns[i]), data[i].type, data[i].name });
@ -381,6 +391,8 @@ Block Block::cloneWithColumns(const Columns & columns) const
throw Exception("Cannot clone block with columns because block has " + toString(num_columns) + " columns, "
"but " + toString(columns.size()) + " columns given.", ErrorCodes::LOGICAL_ERROR);
res.reserve(num_columns);
for (size_t i = 0; i < num_columns; ++i)
res.insert({ columns[i], data[i].type, data[i].name });
@ -393,6 +405,8 @@ Block Block::cloneWithoutColumns() const
Block res;
size_t num_columns = data.size();
res.reserve(num_columns);
for (size_t i = 0; i < num_columns; ++i)
res.insert({ nullptr, data[i].type, data[i].name });

1
src/Core/Block.h
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@ -152,6 +152,7 @@ public:
private:
void eraseImpl(size_t position);
void initializeIndexByName();
void reserve(size_t count);
/// This is needed to allow function execution over data.
/// It is safe because functions does not change column names, so index is unaffected.