Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18266#discussion_r138475068
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRelation.scala
---
@@ -111,7 +111,16 @@ private[sql] case class JDBCRelation(
override val needConversion: Boolean = false
- override val schema: StructType = JDBCRDD.resolveTable(jdbcOptions)
+ override val schema: StructType = {
+ val schema = JDBCRDD.resolveTable(jdbcOptions)
+ val customSchema = jdbcOptions.customSchema
+ if (customSchema.isDefined) {
+ JdbcUtils.parseUserSpecifiedColumnTypes(schema, customSchema.get,
+ sqlContext.sessionState.conf.resolver)
+ } else {
+ schema
+ }
--- End diff --
```Scala
val tableSchema = JDBCRDD.resolveTable(jdbcOptions)
jdbcOptions.customSchema match {
case Some(customSchema) => JdbcUtils.parseUserSpecifiedColumnTypes(
tableSchema, customSchema, sparkSession.sessionState.conf.resolver)
case None => tableSchema
}
```
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