Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22547#discussion_r226338580
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/SupportsBatchRead.java
---
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.sources.v2;
+
+import org.apache.spark.annotation.InterfaceStability;
+import org.apache.spark.sql.sources.v2.reader.BatchScan;
+import org.apache.spark.sql.sources.v2.reader.ScanConfig;
+import org.apache.spark.sql.sources.v2.reader.ScanConfigBuilder;
+
+/**
+ * A mix-in interface for {@link Table}. Table implementations can mixin
this interface to
+ * provide data reading ability for batch processing.
+ */
[email protected]
+public interface SupportsBatchRead extends Table {
+
+ /**
+ * Creates a {@link BatchScan} instance with a {@link ScanConfig} and
user-specified options.
+ *
+ * @param config a {@link ScanConfig} which may contains operator
pushdown information.
+ * @param options the user-specified options, which is same as the one
used to create the
+ * {@link ScanConfigBuilder} that built the given {@link
ScanConfig}.
--- End diff --
Another choice is to let `ScanConfig` carry the options. But `ScanConfig`
is an interface and doing this will put more work at user side, so I decided to
pass the options again here. Feedbacks are welcome!
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