Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7013#discussion_r33335777
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -37,6 +37,19 @@ import org.apache.spark.sql.sources.{ResolvedDataSource,
CreateTableUsingAsSelec
final class DataFrameWriter private[sql](df: DataFrame) {
/**
+ * Check if the provided dataframe has multiple columns
+ * before writing it to an external source
+ */
+ private val error : Unit = {
+ if (df.schema.fieldNames.length !=
df.schema.fieldNames.distinct.length) {
--- End diff --
the best place to do this might be looking at a logical plan that contains
an output operator, rather than putting it in the writer itself.
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