Incorrect conversion of FileScanConfig in from_proto.rs

[richox]

Describe the bug
currently an empty scan projection is converted to None, resulting a slow full table scan for queries like select count(0) from tbl,

To Reproduce
execute select count(0) from tbl and see the converted plan.

Expected behavior
projection should be an empty list other then None

Screenshots

Additional context

the buggy code:

auron/native-engine/auron-serde/src/from_proto.rs

Line 1286 in 95cfd12

let projection = if projection.is_empty() {