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### Cartesian Product Example Calculation

Source: https://hc.jiandaoyun.com/doc/11240

This example illustrates how to calculate the data volume resulting from a horizontal join to identify a Cartesian product. It shows that if the total data volume after the join is greater than twice the sum of the input table sizes, a Cartesian product is triggered.

```plaintext
横向连接后的总数据量=5*5+4*4=41
```

```plaintext
(m+n)*2=（9+9）*2=36
```

```plaintext
41>36
```

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