Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21379#discussion_r195574001
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala ---
@@ -309,7 +309,8 @@ class DataFrameReader private[sql](sparkSession:
SparkSession) extends Logging {
val parts: Array[Partition] = predicates.zipWithIndex.map { case
(part, i) =>
JDBCPartition(part, i) : Partition
}
- val relation = JDBCRelation(parts, options)(sparkSession)
+ val schema =
JDBCRelation.getSchema(sparkSession.sessionState.conf.resolver, options)
+ val relation = JDBCRelation(schema, parts, options)(sparkSession)
--- End diff --
ok
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