No error when boolean is used to filter varchar column

[angelamayxie]

The following query, with setup, executes in Doltgres (and gives the wrong result, an empty set) but produces an error in Postgres

SetUpScript: []string{
	"create table t1(c0 varchar(500), primary key(c0))",
	"insert into t1(c0) values ('')",
},
Assertions: []ScriptTestAssertion{
	{
		Query:    "select 1 from t1 where false=t1.c0",
		Expected: []sql.Row{{1}},
	},
},

postgres

postgres=# create table t1(c0 varchar(500), primary key(c0));
CREATE TABLE
postgres=# insert into t1(c0) values('');
INSERT 0 1
postgres=# select 1 from t1 where false=t1.c0;
ERROR:  operator does not exist: boolean = character varying
LINE 1: select 1 from t1 where false=t1.c0;
                                    ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.

Discovered while fixing dolthub/dolt#10246