xianyinxin commented on a change in pull request #25115: [SPARK-28351][SQL]
Support DELETE in DataSource V2
URL: https://github.com/apache/spark/pull/25115#discussion_r313441345
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceResolution.scala
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@@ -173,6 +173,19 @@ case class DataSourceResolution(
// only top-level adds are supported using AlterTableAddColumnsCommand
AlterTableAddColumnsCommand(table, newColumns.map(convertToStructField))
+ case DeleteFromStatement(AsTableIdentifier(table), tableAlias, condition)
=>
+ throw new AnalysisException(
Review comment:
If I understand correctly, one purpose of removing the first case is we can
execute delete on `parquet` format via this API (if we implement it later) as
@rdblue mentioned. The key point here is we resolve the table use
`V2SessionCatalog` **as the fallback catalog**. The original `resolveTable`
doesn't give any fallback-to-sessionCatalog mechanism (if no catalog found, it
will fallback to `resolveRelation`). So maybe we can modify `resolveTable` and
let it treat `V2SessionCatalog` as a try option:
```
case u @ UnresolvedRelation(CatalogObjectIdentifier(maybeCatalog, ident)) =>
maybeCatalog.orElse(sessionCatalog) match {
case Some(catalogPlugin) =>
loadTable(catalogPlugin,
ident).map(DataSourceV2Relation.create).getOrElse(u)
case None =>
u
}
```
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