Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18445#discussion_r124455651
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
---
@@ -273,6 +273,10 @@ object JdbcUtils extends Logging {
val rsmd = resultSet.getMetaData
val ncols = rsmd.getColumnCount
val fields = new Array[StructField](ncols)
+ // if true, spark will propagate null to underlying
+ // DB engine instead of using type default value
+ val alwaysNullable = true
--- End diff --
put it as the parameter of `getSchema`
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