andygrove opened a new issue, #427:
URL: https://github.com/apache/datafusion-comet/issues/427
### Describe the bug
Our `hash` implementation does not produce the same results as Spark for
some inputs.
I added this test to `CometCastSuite` because that's where we have random
data generators (we should move them into a common class that more test suites
can use).
```scala
test("hash") {
val input = generateStrings(timestampPattern, 8).toDF("a")
withTempPath { dir =>
val data = roundtripParquet(input, dir).coalesce(1)
data.createOrReplaceTempView("t")
val df = spark.sql(s"select a, hash(a) from t order by a")
checkSparkAnswerAndOperator(df)
}
}
```
Example output:
```
!== Correct Answer - 1000 == == Spark Answer - 1000 ==
struct<a:string,hash(a):int> struct<a:string,hash(a):int>
![,142593372] [,0]
![ 099,-1611881412] [ 099,-881749019]
![ 1 474,240523873] [ 1 474,-1111423867]
![ 12852,-1057581169] [ 12852,-404859411]
![ 18,-492750382] [ 18,1333608017]
```
### Steps to reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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