wangyum opened a new pull request #34851:
URL: https://github.com/apache/spark/pull/34851
Backport #34811
### What changes were proposed in this pull request?
Fix cast string type to decimal type only if
`spark.sql.legacy.allowNegativeScaleOfDecimal` is enabled. For example:
```scala
import org.apache.spark.sql.types._
import org.apache.spark.sql.Row
spark.conf.set("spark.sql.legacy.allowNegativeScaleOfDecimal", true)
val data = Seq(Row("7.836725755512218E38"))
val schema = StructType(Array(StructField("a", StringType, false)))
val df =spark.createDataFrame(spark.sparkContext.parallelize(data), schema)
df.select(col("a").cast(DecimalType(37,-17))).show
```
The result is null since
[SPARK-32706](https://issues.apache.org/jira/browse/SPARK-32706).
### Why are the changes needed?
Fix regression bug.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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