brkyvz commented on a change in pull request #26297: [SPARK-29665][SQL] refine
the TableProvider interface
URL: https://github.com/apache/spark/pull/26297#discussion_r343295581
##########
File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/TableProvider.java
##########
@@ -36,26 +39,34 @@
public interface TableProvider {
/**
- * Return a {@link Table} instance to do read/write with user-specified
options.
+ * Infer the schema of the table that is identified by the given options.
+ *
+ * @param options The options that can identify a table, e.g. file path,
Kafka topic name, etc.
+ * It's an immutable case-insensitive string-to-string map.
*
- * @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.
*/
- Table getTable(CaseInsensitiveStringMap options);
+ StructType inferSchema(CaseInsensitiveStringMap options);
/**
- * Return a {@link Table} instance to do read/write with user-specified
schema and options.
- * <p>
- * By default this method throws {@link UnsupportedOperationException},
implementations should
- * override this method to handle user-specified schema.
- * </p>
- * @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.
- * @param schema the user-specified schema.
- * @throws UnsupportedOperationException
+ * Infer the partitioning of the table that is identified by the given
options.
+ *
+ * @param schema The schema of the table.
+ * @param options The options that can identify a table, e.g. file path,
Kafka topic name, etc.
+ * It's an immutable case-insensitive string-to-string map.
+ */
+ Transform[] inferPartitioning(StructType schema, CaseInsensitiveStringMap
options);
Review comment:
We've also had bugs in the past where the inference picks a different data
type than what you want, therefore it's safer that if a user provides a schema
to use the data type in the provided schema for the partition columns
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