maropu commented on a change in pull request #29939:
URL: https://github.com/apache/spark/pull/29939#discussion_r500016049
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File path: sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
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@@ -333,9 +333,26 @@ class DataFrameReader private[sql](sparkSession:
SparkSession) extends Logging {
assertNoSpecifiedSchema("jdbc")
// properties should override settings in extraOptions.
this.extraOptions ++= properties.asScala
- // explicit url and dbtable should override all
- this.extraOptions ++= Seq(JDBCOptions.JDBC_URL -> url,
JDBCOptions.JDBC_TABLE_NAME -> table)
- format("jdbc").load()
+ // explicit url should override all
+ this.extraOptions ++= Seq(JDBCOptions.JDBC_URL -> url)
+
+ import sparkSession.sessionState.analyzer.NonSessionCatalogAndIdentifier
+
+ this.source = "jdbc"
+ if (table.contains(" ")) { // if table is not a table name, e.g. a SELECT
statement
Review comment:
What if we don't have this check?
```
this.source = "jdbc"
sparkSession.sessionState.sqlParser.parseMultipartIdentifier(table)
match {
case _ @ NonSessionCatalogAndIdentifier(_, _) =>
this.table(table)
case _ =>
// explicit dbtable should override all
this.extraOptions += JDBCOptions.JDBC_TABLE_NAME -> table
load
}
```
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