shapes operator de-unions in vector runtime

[philrz]

$ echo '
  1::(int64|null)
  null::(int64|null)
  2::(int64|string)
' | super -vam -c "shapes | sort" -

1
2

Details

Repro is with super commit 303652b.

The union types are present in the output when the same query is executed in sequential runtime.

$ super -version
Version: v0.3.0-105-g303652bd0

$ echo '
  1::(int64|null)
  null::(int64|null)
  2::(int64|string)
' | super -sam -c "shapes | sort" -

1::(int64|null)
2::(int64|string)