kevinmingtarja commented on issue #325:
URL:
https://github.com/apache/datafusion-comet/issues/325#issuecomment-2081332989
Current state for reference:
```
scala> import org.apache.spark.sql.types._
import org.apache.spark.sql.types._
scala> val inputs = Seq("", "0", "1", "+1.0", ".34", "-10.0",
"4e7").toDF("n")
inputs: org.apache.spark.sql.DataFrame = [n: string]
scala> inputs.write.mode("overwrite").parquet("test.parquet")
24/04/28 11:46:51 INFO src/lib.rs: Comet native library initialized
scala> val df = spark.read.parquet("test.parquet")
df: org.apache.spark.sql.DataFrame = [n: string]
scala> val df2 = df.withColumn("converted",
col("n").cast(DataTypes.createDecimalType(10, 2)))
df2: org.apache.spark.sql.DataFrame = [n: string, converted: decimal(10,2)]
scala> df2.show
+-----+---------+
| n|converted|
+-----+---------+
|-10.0| -10.00|
| +1.0| 1.00|
| .34| 0.34|
| 4e7| null|
| 1| 1.00|
| 0| 0.00|
| | 0.00|
+-----+---------+
scala> spark.conf.set("spark.comet.enabled", false)
scala> df2.show
+-----+-----------+
| n| converted|
+-----+-----------+
|-10.0| -10.00|
| +1.0| 1.00|
| .34| 0.34|
| 4e7|40000000.00|
| 1| 1.00|
| 0| 0.00|
| | null|
+-----+-----------+
```
Note: I encountered a `java.lang.AssertionError: assertion failed:
Decimal$DecimalIsFractional` on the second `df2.show`, but it seems like a
known issue and can safely be ignored:
https://kb.databricks.com/scala/decimal-is-fractional-error
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