vinishjail97 commented on code in PR #935:
URL: https://github.com/apache/incubator-xtable/pull/935#discussion_r4252200179
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xtable-api/src/main/java/org/apache/xtable/model/sync/SyncResult.java:
##########
@@ -50,6 +50,18 @@ public class SyncResult {
// The sync status for each catalog.
@Builder.Default List<CatalogSyncStatus> catalogSyncStatusList =
Collections.emptyList();
+ /**
+ * Returns the error message of the table format sync of the given result,
or null when the sync
+ * reported no error details.
+ */
+ public static String getErrorMessage(SyncResult syncResult) {
Review Comment:
Done in 2df63f60, `getErrorMessage()` is now an instance method.
##########
xtable-core/src/main/java/org/apache/xtable/index/Index.java:
##########
@@ -0,0 +1,56 @@
+/*
+ * 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.xtable.index;
+
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Row;
+
+/**
+ * An index over a table that maps the values of a column to the rows that
hold them, so an engine
+ * can find those rows without a full table scan or join.
+ *
+ * @param <T> The table type of the source format (for example an Iceberg
{@code Table})
+ */
+public interface Index<T> {
+ /**
+ * Checks whether the index of the given column exists.
+ *
+ * @param columnName The indexed column
+ * @return true when a build of the index has completed
+ */
+ boolean doesIndexExist(String columnName);
+
+ /**
+ * Brings the indexes of the configured columns up to date with the current
state of the table.
+ * The indexed columns are part of the index configuration, not of the sync.
+ *
+ * @param table The table to index
+ */
+ void syncIndex(T table);
+
+ /**
+ * Looks up the given keys in the index of a column.
+ *
+ * @param table The table the index belongs to
+ * @param keys The values to look up, in the column named {@code columnName}
+ * @param columnName The indexed column
+ * @return the matches of the keys. The schema of the result depends on the
type of the index.
+ */
+ Dataset<Row> lookup(T table, Dataset<Row> keys, String columnName);
Review Comment:
Makes sense, split in 2df63f60 along the lines of Lucene's IndexWriter and
IndexReader. `IndexWriter` (`syncIndex`) has no Spark types, and
`HudiBackedSecondaryIndexWriter` takes only a Hadoop `Configuration`.
`IndexReader<T, K, R>` (`doesIndexExist`, `lookup`) takes the key and result
types as parameters, so the interface does not depend on Spark either;
`HudiBackedSecondaryIndexReader` is the Spark implementation with
`Dataset<Row>`. At runtime the sync still commits through Hudi's Spark engine,
because Hudi's Java engine cannot build the secondary index yet
(apache/hudi#20244, plus an NPE on Java secondary index updates that still
needs an issue). Once those are fixed, the sync can move to the Java engine
without an API change.
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