Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/12601#discussion_r80641407 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcRelationProvider.scala --- @@ -19,37 +19,102 @@ package org.apache.spark.sql.execution.datasources.jdbc import java.util.Properties -import org.apache.spark.sql.SQLContext -import org.apache.spark.sql.sources.{BaseRelation, DataSourceRegister, RelationProvider} +import scala.collection.JavaConverters.mapAsJavaMapConverter -class JdbcRelationProvider extends RelationProvider with DataSourceRegister { +import org.apache.spark.sql.{AnalysisException, DataFrame, SaveMode, SQLContext} +import org.apache.spark.sql.sources.{BaseRelation, CreatableRelationProvider, DataSourceRegister, RelationProvider} + +class JdbcRelationProvider extends CreatableRelationProvider + with RelationProvider with DataSourceRegister { override def shortName(): String = "jdbc" - /** Returns a new base relation with the given parameters. */ override def createRelation( sqlContext: SQLContext, parameters: Map[String, String]): BaseRelation = { val jdbcOptions = new JDBCOptions(parameters) - if (jdbcOptions.partitionColumn != null - && (jdbcOptions.lowerBound == null - || jdbcOptions.upperBound == null - || jdbcOptions.numPartitions == null)) { - sys.error("Partitioning incompletely specified") - } + val partitionColumn = jdbcOptions.partitionColumn + val lowerBound = jdbcOptions.lowerBound + val upperBound = jdbcOptions.upperBound + val numPartitions = jdbcOptions.numPartitions - val partitionInfo = if (jdbcOptions.partitionColumn == null) { + val partitionInfo = if (partitionColumn == null) { null } else { JDBCPartitioningInfo( - jdbcOptions.partitionColumn, - jdbcOptions.lowerBound.toLong, - jdbcOptions.upperBound.toLong, - jdbcOptions.numPartitions.toInt) + partitionColumn, lowerBound.toLong, upperBound.toLong, numPartitions.toInt) } val parts = JDBCRelation.columnPartition(partitionInfo) val properties = new Properties() // Additional properties that we will pass to getConnection parameters.foreach(kv => properties.setProperty(kv._1, kv._2)) JDBCRelation(jdbcOptions.url, jdbcOptions.table, parts, properties)(sqlContext.sparkSession) } + + /* + * The following structure applies to this code: --- End diff -- I also took a look at @gatorsmile 's approach, I think it's easier to understand, why it's rejected? We can also get rid of the `return`: ``` if (tableExists) { mode match { case SaveMode.Ignore => ...... } } else { ...... } ```
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