Block MySQLBlockInputStream::readImpl()
{
auto row = result.fetch();
if (!row)
return {};
auto block = description.sample_block.cloneEmpty();
/// cache pointers returned by the calls to getByPosition
std::vector<IColumn *> columns(block.columns());
for (const auto i : ext::range(0, columns.size()))
columns[i] = block.getByPosition(i).column.get();
std::size_t num_rows = 0;
while (row)
{
for (const auto idx : ext::range(0, row.size()))
{
const auto value = row[idx];
if (!value.isNull())
insertValue(columns[idx], description.types[idx], value);
else
insertDefaultValue(columns[idx], *description.sample_columns[idx]);
}
++num_rows;
if (num_rows == max_block_size)
break;
row = result.fetch();
}
return block;
}
std::unique_ptr<IMergeTreeIndex> minmaxIndexCreator(
const NamesAndTypesList & new_columns,
std::shared_ptr<ASTIndexDeclaration> node,
const Context & context)
{
if (node->name.empty())
throw Exception("Index must have unique name", ErrorCodes::INCORRECT_QUERY);
if (node->type->arguments)
throw Exception("Minmax index have not any arguments", ErrorCodes::INCORRECT_QUERY);
ASTPtr expr_list = MergeTreeData::extractKeyExpressionList(node->expr->clone());
auto syntax = SyntaxAnalyzer(context, {}).analyze(
expr_list, new_columns);
auto minmax_expr = ExpressionAnalyzer(expr_list, syntax, context).getActions(false);
auto sample = ExpressionAnalyzer(expr_list, syntax, context)
.getActions(true)->getSampleBlock();
Names columns;
DataTypes data_types;
for (size_t i = 0; i < expr_list->children.size(); ++i)
{
const auto & column = sample.getByPosition(i);
columns.emplace_back(column.name);
data_types.emplace_back(column.type);
}
return std::make_unique<MergeTreeMinMaxIndex>(
node->name, std::move(minmax_expr), columns, data_types, sample, node->granularity);
}
LRESULT LocationsPage::onClickedRemove(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
int i = -1;
while((i = ctrlDirectories.GetNextItem(-1, LVNI_SELECTED)) != -1) {
auto itemIter = getByPosition(i);
if(removeDirectory(itemIter->first)) {
ctrlDirectories.DeleteItem(i);
i--;
}
}
return 0;
}
LRESULT LocationsPage::onClickedRename(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
int i = -1;
while((i = ctrlDirectories.GetNextItem(i, LVNI_SELECTED)) != -1) {
auto itemIter = getByPosition(i);
LineDlg dlg;
dlg.allowEmpty = false;
dlg.title = TSTRING(RENAME);
dlg.description = Text::toT(itemIter->first);
dlg.line = Text::toT(itemIter->second);
if (dlg.DoModal() == IDOK) {
itemIter->second = Text::fromT(dlg.line);
ctrlDirectories.SetItemText(i, 0, dlg.line.c_str());
}
}
return 0;
}
