Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18445#discussion_r124970124
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
---
@@ -266,10 +266,14 @@ object JdbcUtils extends Logging {
/**
* Takes a [[ResultSet]] and returns its Catalyst schema.
*
+ * @param alwaysNullable If true, all the columns are nullable.
* @return A [[StructType]] giving the Catalyst schema.
* @throws SQLException if the schema contains an unsupported type.
*/
- def getSchema(resultSet: ResultSet, dialect: JdbcDialect): StructType = {
+ def getSchema(
+ resultSet: ResultSet,
+ dialect: JdbcDialect,
+ alwaysNullable: Boolean = true): StructType = {
--- End diff --
You should change the value to `true` in the caller side.
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