Updating IsSigned to return true for Boolean (i.e. TINYINT(1))

Author: fulghum

enginetest/queries/query_plans.go

@@ -3608,7 +3608,7 @@ inner join pq on true
 			" ├─ HashIn\n" +
 			" │   ├─ Eq\n" +
 			" │   │   ├─ mytable.i:0!null\n" +
-			" │   │   └─ 1 (double)\n" +
+			" │   │   └─ 1 (bigint)\n" +
 			" │   └─ TUPLE(true (tinyint(1)))\n" +
 			" └─ Table\n" +
 			"     ├─ name: mytable\n" +
@@ -3621,7 +3621,7 @@ inner join pq on true
 			" ├─ HashIn\n" +
 			" │   ├─ Eq\n" +
 			" │   │   ├─ mytable.i:0!null\n" +
-			" │   │   └─ 0 (double)\n" +
+			" │   │   └─ 0 (bigint)\n" +
 			" │   └─ TUPLE(true (tinyint(1)))\n" +
 			" └─ Table\n" +
 			"     ├─ name: mytable\n" +

sql/types/typecheck.go

@@ -102,7 +102,7 @@ func IsSigned(t sql.Type) bool {
 	if _, ok := t.(SystemBoolType); ok {
 		return true
 	}
-	return t == Int8 || t == Int16 || t == Int24 || t == Int32 || t == Int64
+	return t == Int8 || t == Int16 || t == Int24 || t == Int32 || t == Int64 || t == Boolean
 }
 
 // IsText checks if t is a CHAR, VARCHAR, TEXT, BINARY, VARBINARY, or BLOB (including TEXT and BLOB variants).