chore: fix warnings in scala part #523
Description
I don't think it is critical, but it would be nice to analyze and fix incomplete pattern matching:
[warn] /home/runner/work/graphframes/graphframes/src/main/scala/org/graphframes/pattern/patterns.scala:33:69: match may not be exhaustive.
[warn] It would fail on the following inputs: ~(~(~(~(~(~(_, "-"), "["), _), "]"), (x: String forSome x not in "->")), _), ~(~(~(~(~(~(_, "-"), "["), _), (x: String forSome x not in "]")), "->"), _), ~(~(~(~(~(~(_, "-"), "["), _), (x: String forSome x not in "]")), (x: String forSome x not in "->")), _), ~(~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), _), "]"), "->"), _), ~(~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), _), "]"), (x: String forSome x not in "->")), _), ~(~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), _), (x: String forSome x not in "]")), "->"), _), ~(~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), _), (x: String forSome x not in "]")), (x: String forSome x not in "->")), _), ~(~(~(~(~(~(_, (x: String forSome x not in "-")), "["), _), "]"), "->"), _), ~(~(~(~(~(~(_, (x: String forSome x not in "-")), "["), _), "]"), (x: String forSome x not in "->")), _), ~(~(~(~(~(~(_, (x: String forSome x not in "-")), "["), _), (x: String forSome x not i
[warn] vertex ~ "-" ~ "[" ~ "[a-zA-Z0-9_]+".r ~ "]" ~ "->" ~ vertex ^^ {
[warn] ^
[warn] /home/runner/work/graphframes/graphframes/src/main/scala/org/graphframes/pattern/patterns.scala:37:49: match may not be exhaustive.
[warn] It would fail on the following inputs: ~(~(~(~(~(_, "-"), "["), "]"), (x: String forSome x not in "->")), _), ~(~(~(~(~(_, "-"), "["), (x: String forSome x not in "]")), "->"), _), ~(~(~(~(~(_, "-"), "["), (x: String forSome x not in "]")), (x: String forSome x not in "->")), _), ~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), "]"), "->"), _), ~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), "]"), (x: String forSome x not in "->")), _), ~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), (x: String forSome x not in "]")), "->"), _), ~(~(~(~(~(_, "-"), (x: String forSome x not in "[")), (x: String forSome x not in "]")), (x: String forSome x not in "->")), _), ~(~(~(~(~(_, (x: String forSome x not in "-")), "["), "]"), "->"), _), ~(~(~(~(~(_, (x: String forSome x not in "-")), "["), "]"), (x: String forSome x not in "->")), _), ~(~(~(~(~(_, (x: String forSome x not in "-")), "["), (x: String forSome x not in "]")), "->"), _), ~(~(~(~(~(_, (x: String forSome x not in
[warn] vertex ~ "-" ~ "[" ~ "]" ~ "->" ~ vertex ^^ { case src ~ "-" ~ "[" ~ "]" ~ "->" ~ dst =>
[warn] ^
[warn] two warnings found
At least something like "UnreachableException" may be introduced here.