Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/15664#discussion_r94004299 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala --- @@ -211,6 +211,52 @@ object JdbcUtils extends Logging { } /** + * Returns the schema if the table already exists in the JDBC database. + */ + def getSchema(conn: Connection, url: String, table: String): Option[StructType] = { + val dialect = JdbcDialects.get(url) + + Try { + val statement = conn.prepareStatement(dialect.getSchemaQuery(table)) + try { + getSchema(statement.executeQuery(), dialect) + } finally { + statement.close() + } + } match { + case Success(v) => + Some(v) + case Failure(e) => + None + } + } + + /** + * Returns the saving schema using rddSchema's sequence and tableSchema's name. --- End diff -- Yep. I'll add more correct details here.
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