Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/16365
This is actually the message users face in some cases. Isn't it :)?
```scala
val df1 = spark.range(10).selectExpr("id as intcol", "cast(id as int) as
longcol")
df1.write.parquet("/tmp/a")
val df2 = spark.range(10).selectExpr("id as intcol", "id as longcol")
df2.write.parquet("/tmp/b")
spark.read.option("mergeSchema", true).parquet("/tmp/a", "/tmp/b").show()
```
**Before**
```
...
Caused by: org.apache.spark.SparkException: Failed to merge field longcol:
Failed to merge incompatible data types IntegerType and LongType
at
org.apache.spark.sql.types.StructType$$anonfun$merge$1$$anonfun$apply$3.apply(StructType.scala:480)
at
org.apache.spark.sql.types.StructType$$anonfun$merge$1$$anonfun$apply$3.apply(StructType.scala:471)
at scala.Option.map(Option.scala:146)
...
```
**After**
```
...
Caused by: org.apache.spark.SparkException: Failed to merge incompatible
data types IntegerType and LongType
at org.apache.spark.sql.types.StructType$.merge(StructType.scala:515)
at
org.apache.spark.sql.types.StructType$$anonfun$merge$1$$anonfun$apply$3.apply(StructType.scala:473)
at
org.apache.spark.sql.types.StructType$$anonfun$merge$1$$anonfun$apply$3.apply(StructType.scala:471)
...
```
BTW, it looks the test in `DataTypeSuite` was not added by mistake.
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