Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18266#discussion_r137719100
--- Diff:
examples/src/main/scala/org/apache/spark/examples/sql/SQLDataSourceExample.scala
---
@@ -185,6 +185,10 @@ object SQLDataSourceExample {
connectionProperties.put("password", "password")
val jdbcDF2 = spark.read
.jdbc("jdbc:postgresql:dbserver", "schema.tablename",
connectionProperties)
+ // Specifying dataframe column data types on read
--- End diff --
> Specifying the custom data types of columns
---
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