Info API::DropIndex(SqlCommandDropIndex* command){
CatalogManager catalog_manager;
IndexManager index_manager;
std::string index_name = command->index_name();
if (!catalog_manager.HasIndex(index_name)){
std::string error_info;
error_info = "Index \"" + index_name + "\" not exists.";
return Info(error_info);
}
else{
IndexInfo index = catalog_manager.GetIndexInfo(index_name);
std::string table_name = index.table_name();
std::string attribute_name = index.attribute_name();
index_manager.EmptyIndex(index);
if (catalog_manager.DropIndex(index_name)){
//update table info
TableInfo table = catalog_manager.GetTableInfo(table_name);
table.remove_index(attribute_name,index_name);
catalog_manager.WriteTableInfo(table);
return Info();
}
else{
return Info("Drop index Failed");
}
}
}
