Github user budde commented on a diff in the pull request:
https://github.com/apache/spark/pull/17249#discussion_r105499679
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -356,13 +356,10 @@ private[hive] object HiveMetastoreCatalog {
.filterKeys(!inferredSchema.map(_.name.toLowerCase).contains(_))
.values
.filter(_.nullable)
-
// Merge missing nullable fields to inferred schema and build a
case-insensitive field map.
val inferredFields = StructType(inferredSchema ++ missingNullables)
.map(f => f.name.toLowerCase -> f).toMap
- StructType(metastoreFields.map { case(name, field) =>
- field.copy(name = inferredFields(name).name)
- }.toSeq)
+ StructType(metastoreSchema.map(f => f.copy(name =
inferredFields(f.name).name)))
--- End diff --
This should ensure the proper ordering is used. Iterating over the
```metastoreFields``` map isn't guaranteed to maintain the original ordering.
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