xianyinxin commented on a change in pull request #25626: [SPARK-28892][SQL] Add
UPDATE support for DataSource V2
URL: https://github.com/apache/spark/pull/25626#discussion_r320627347
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Strategy.scala
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@@ -245,6 +246,28 @@ object DataSourceV2Strategy extends Strategy with
PredicateHelper {
}.toArray
DeleteFromTableExec(r.table.asDeletable, filters) :: Nil
+ case UpdateTable(r: DataSourceV2Relation, attrs, values, condition) =>
+ val nested =
attrs.asInstanceOf[Seq[Any]].filterNot(_.isInstanceOf[AttributeReference])
+ if (nested.nonEmpty) {
+ throw new AnalysisException(s"Update only support non-nested fields.
Nested: $nested")
+ }
+
+ val attrsNames = attrs.map(_.name)
+ // fail if any updated value cannot be converted.
+ val updatedValues = values.map {
+ v => DataSourceStrategy.translateExpression(v).getOrElse(
+ throw new AnalysisException(s"Exec update failed:" +
+ s" cannot translate update set to source expression: $v"))
+ }
+ // fail if any filter cannot be converted. correctness depends on
removing all matching data.
+ val filters = condition.map(
+ splitConjunctivePredicates(_).map {
+ f => DataSourceStrategy.translateFilter(f).getOrElse(
+ throw new AnalysisException(s"Exec update failed:" +
+ s" cannot translate expression to source filter: $f"))
+ }.toArray).getOrElse(Array.empty[Filter])
+ UpdateTableExec(r.table.asUpdatable, attrsNames, updatedValues,
filters)::Nil
Review comment:
Fixed.
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