Hi all: The initial discussion is at https://issues.apache.org/jira/browse/IOTDB-1160)
First Solution: "*" matches just one layer and "**" matches one or more layers. As a result, the SQL statement "select * from root" have to be converted into "select ** from root". It seems a little bit disappointing. Second Solution: "*" matches one or more layers by default. And we can put something like "1 layer"(layer is the keyword) in the SQL statement to strengthen the semantics to match just one layer. More, "2 layers" to match just two layers and so on. This solution can be more scalable, I think. Does anyone have any idea about this? Welcome to discuss.
