cloud-fan commented on a change in pull request #25651: [SPARK-28948][SQL]
Support passing all Table metadata in TableProvider
URL: https://github.com/apache/spark/pull/25651#discussion_r332095472
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File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/TableProvider.java
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@@ -36,26 +35,12 @@
public interface TableProvider {
/**
- * Return a {@link Table} instance to do read/write with user-specified
options.
+ * Return a {@link Table} instance with the given table options to do
read/write.
+ * Implementations should infer the table schema and partitioning.
*
* @param options the user-specified options that can identify a table, e.g.
file path, Kafka
* topic name, etc. It's an immutable case-insensitive
string-to-string map.
*/
+ // TODO: this should take a Map<String, String> as table properties.
Review comment:
It turns out that this is more complicated than I thought.
For file source, we need to list the files to scan. If we need to infer the
schema/partitioning, we will list the files a little earlier, and reuse the
listed files when scan.
That said, we need to either make `TableProvider` stateful, so that file
source can keep the listed files after schema inference. Or we need to
re-design the API so that it can carry states after schema inference.
Maybe we should move on with 2 `getTable` methods as it is in this PR.
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