cloud-fan commented on a change in pull request #29317:
URL: https://github.com/apache/spark/pull/29317#discussion_r463636749
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
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@@ -819,8 +819,10 @@ object JdbcUtils extends Logging {
if (null != customSchema && customSchema.nonEmpty) {
Review comment:
I don't know which JDBC server supports nested schema. But IIUC this
feature is to specify the type, and I think it can be used to specify the data
type of nested fields as well.
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