HEX(*) fails with panic

[macneale4]

Dolt is panicing on a bad query where the case of HEX makes a difference.:

Dolt Behavior:

foo> create table t (b binary(2) primary key);
foo> select hex(*) from t;
a '*' is in a context where it is not allowed.
foo> select HEX(*) from t;
panic: star is just a placeholder node, but IsNullable was called [recovered]
        panic: star is just a placeholder node, but IsNullable was called

goroutine 1 [running]:
github.com/dolthub/go-mysql-server/sql/planbuilder.(*Builder).Parse.func1()
        /Users/neil/Documents/go-mysql-server/sql/planbuilder/parse.go:127 +0xa4
panic({0x1064f4ea0, 0x10695d860})
        /usr/local/go/src/runtime/panic.go:884 +0x1f4

MySQL Behavior:

mysql> create table t (b binary(2) primary key);
Query OK, 0 rows affected (0.01 sec)
mysql> select hex(*) from t;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*) from t' at line 1
mysql> select HEX(*) from t;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*) from t' at line 1