sql: "SELECT~~+~++~\xbd(*)" and handling *StarExpr in EvalExpr

[tbg]

Expr: (*parser.StarExpr)(0x20849c028)({
 TableName: (*parser.QualifiedName)(<nil>)
})
panic: eval: unsupported expression type: *parser.StarExpr

I'm not sure whether

• the above SELECT should actually parse (doesn't for Postgres, obviously)
• a *StarExpr needs to be handled in EvalExpr. It contains a QualifiedName, which generally needs to be evaluated.

  gofuzz

[petermattis]

Definitely a bug, but I need to think about this further. Expanding StarExpr into the full list of columns isn't necessarily correct for aggregation functions like COUNT(*).