我有一个 spark 数据框，它看起来像这样，其中 expr 是 SQL/Hive 过滤器表达式。
+-----------------------------------------+
|expr |var1 |var2 |
+-------------------------+---------+-----+
|var1 > 7 |9 |0 |
|var1 > 7 |9 |0 |
|var1 > 7 |9 |0 |
|var1 > 7 |9 |0 |
|var1 = 3 AND var2 >= 0 |9 |0 |
|var1 = 3 AND var2 >= 0 |9 |0 |
|var1 = 3 AND var2 >= 0 |9 |0 |
|var1 = 3 AND var2 >= 0 |9 |0 |
|var1 = 2 …