cloud-fan commented on a change in pull request #23266: [SPARK-26313][SQL] move
`newScanBuilder` from Table to read related mix-in traits
URL: https://github.com/apache/spark/pull/23266#discussion_r241236966
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/SupportsBatchRead.java
##########
@@ -24,10 +24,10 @@
/**
* An empty mix-in interface for {@link Table}, to indicate this table
supports batch scan.
* <p>
- * If a {@link Table} implements this interface, its {@link
Table#newScanBuilder(DataSourceOptions)}
- * must return a {@link ScanBuilder} that builds {@link Scan} with {@link
Scan#toBatch()}
- * implemented.
+ * If a {@link Table} implements this interface, the
+ * {@link SupportsRead#newScanBuilder(DataSourceOptions)} must return a {@link
ScanBuilder} that
+ * builds {@link Scan} with {@link Scan#toBatch()} implemented.
* </p>
*/
@Evolving
-public interface SupportsBatchRead extends Table { }
+public interface SupportsBatchRead extends SupportsRead { }
Review comment:
`SupportsRead` only makes sense under the table context. It also simplifies
the code
```
public interface SupportsBatchRead extends Table, SupportsRead { }
public interface SupportsMicroBatchRead extends Table, SupportsRead { }
public interface SupportsContinuousRead extends Table, SupportsRead { }
```
to
```
public interface SupportsBatchRead extends SupportsRead { }
public interface SupportsMicroBatchRead extends SupportsRead { }
public interface SupportsContinuousRead extends SupportsRead { }
```
BTW `SupportsRead` is package private.
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