Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21590#discussion_r197620496
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcRelationProvider.scala
---
@@ -58,6 +58,10 @@ class JdbcRelationProvider extends
CreatableRelationProvider
parameters: Map[String, String],
df: DataFrame): BaseRelation = {
val options = new JDBCOptions(parameters)
+ require(
+ options.tableName.isDefined,
+ s"Option '${JDBCOptions.JDBC_TABLE_NAME}' is required. " +
+ s"Option '${JDBCOptions.JDBC_QUERY_STRING}' is not applicable
while writing.")
--- End diff --
Let us create a `JDBCOptionsInWrite`?
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