feat: Make more data dynamic (#2197)

#### Summary

This PR makes more fields dynamic, based on the random number seed. The data stays deterministic, but enables each row to have a different value

Author: bbernays

schema/testdata.go

@@ -307,13 +307,26 @@ func (tg TestDataGenerator) getExampleJSON(colName string, dataType arrow.DataTy
 		if opts.UseHomogeneousType {
 			return `{"test":["a", "b", "c"]}`
 		}
-		return `{"test":["a","b",3]}`
+		return fmt.Sprintf(`{"test":["a","b",%d]}`, rnd.Intn(100000))
 	}
 	if arrow.TypeEqual(dataType, types.ExtensionTypes.Inet) {
-		return `"192.0.2.0/24"`
+		// Create a random IPv4 address
+		ip := make([]byte, 4)
+		_, _ = rnd.Read(ip)
+
+		// Generate a CIDR prefix length between 8 and 30
+		cidr := 8 + rnd.Intn(23)
+
+		// Format as an IP address with CIDR notation
+		return fmt.Sprintf(`"%d.%d.%d.%d/%d"`, ip[0], ip[1], ip[2], ip[3], cidr)
 	}
 	if arrow.TypeEqual(dataType, types.ExtensionTypes.MAC) {
-		return `"aa:bb:cc:dd:ee:ff"`
+		mac := make([]byte, 6)
+		_, _ = rnd.Read(mac)
+		// Ensure it's a unicast address (clear the multicast bit)
+		mac[0] &= 0xfe
+		// Format as a MAC address string
+		return fmt.Sprintf(`"%02x:%02x:%02x:%02x:%02x:%02x"`, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5])
 	}
 
 	// handle signed integers