ulysses-you commented on pull request #26875:
URL: https://github.com/apache/spark/pull/26875#issuecomment-647244110
---- test3 ----
```
val df1 = spark.range(0, 20000, 1, 200).selectExpr("uuid() as c1")
val df2 = spark.range(0, 20000, 1, 200).selectExpr("uuid() as c2")
val start = System.currentTimeMillis
df1.join(df2).where("c1 like c2").count()
// 3 times test
// before 159226, 159147, 159587
// after 159641, 160960, 160091
println(System.currentTimeMillis - start)
```
The worst case is that do compare and compile each row. And it seems only
little regression.
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