Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18445#discussion_r124459553
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
---
@@ -264,12 +264,16 @@ object JdbcUtils extends Logging {
}
/**
- * Takes a [[ResultSet]] and returns its Catalyst schema.
- *
- * @return A [[StructType]] giving the Catalyst schema.
- * @throws SQLException if the schema contains an unsupported type.
- */
- def getSchema(resultSet: ResultSet, dialect: JdbcDialect): StructType = {
+ * Takes a [[ResultSet]] and returns its Catalyst schema.
+ *
+ * @param alwaysNullable - If true, spark will propagate null
+ * to underlying DB engine instead of using type
default value
--- End diff --
> @param alwaysNullable If true, all the columns are nullable.
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