[fix] (inverted index) fix index compaction (#43046)

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Introduced by #41625

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Related PR: #41625

Problem Summary:
In #41625, the index compaction process was modified. During index
compaction, the output rowset has not yet been built, so the output
rowset cannot be accessed at this point.

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be/src/olap/compaction.cpp

@@ -519,7 +519,6 @@ Status Compaction::do_inverted_index_compaction() {
     if (dest_segment_num <= 0) {
         LOG(INFO) << "skip doing index compaction due to no output segments"
                   << ". tablet=" << _tablet->tablet_id() << ", input row number=" << _input_row_num
-                  << ", output row number=" << _output_rowset->num_rows()
                   << ". elapsed time=" << inverted_watch.get_elapse_second() << "s.";
         return Status::OK();
     }

regression-test/suites/inverted_index_p0/index_compaction/test_index_compaction_empty_segments.groovy

@@ -0,0 +1,99 @@
+// 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.
+
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
+import org.awaitility.Awaitility
+
+suite("test_index_compaction_empty_segments", "p0") {
+
+    def compaction_table_name = "test_index_compaction_empty_segments"
+    def backendId_to_backendIP = [:]
+    def backendId_to_backendHttpPort = [:]
+    getBackendIpHttpPort(backendId_to_backendIP, backendId_to_backendHttpPort);
+    def set_be_config = { key, value ->
+        for (String backend_id: backendId_to_backendIP.keySet()) {
+            def (code, out, err) = update_be_config(backendId_to_backendIP.get(backend_id), backendId_to_backendHttpPort.get(backend_id), key, value)
+            logger.info("update config: code=" + code + ", out=" + out + ", err=" + err)
+        }
+    }
+    set_be_config.call("inverted_index_compaction_enable", "true")
+
+    sql "DROP TABLE IF EXISTS ${compaction_table_name}"
+    sql """ 
+        CREATE TABLE ${compaction_table_name} (
+            `k` int(11) NULL,
+            `v` varchar(20) NULL,
+            INDEX v_idx (`v`)USING INVERTED COMMENT ''
+        ) ENGINE=OLAP
+            DISTRIBUTED BY HASH(`k`) BUCKETS 1
+            PROPERTIES (
+            "replication_allocation" = "tag.location.default: 1",
+            "disable_auto_compaction" = "true"
+        );
+    """
+
+    sql """ INSERT INTO ${compaction_table_name} VALUES (10, "andy"); """
+    sql """ INSERT INTO ${compaction_table_name} VALUES (10, "tom"); """
+    sql """ INSERT INTO ${compaction_table_name} VALUES (10, "jodie"); """
+    sql """ INSERT INTO ${compaction_table_name} VALUES (10, "jerry"); """
+    sql """ INSERT INTO ${compaction_table_name} VALUES (10, "ok"); """
+    sql """ DELETE FROM ${compaction_table_name} where k = 10; """
+
+    //TabletId,ReplicaId,BackendId,SchemaHash,Version,LstSuccessVersion,LstFailedVersion,LstFailedTime,LocalDataSize,RemoteDataSize,RowCount,State,LstConsistencyCheckTime,CheckVersion,VersionCount,QueryHits,PathHash,MetaUrl,CompactionStatus
+    def tablets = sql_return_maparray """ show tablets from ${compaction_table_name}; """
+
+    // trigger compactions for all tablets in ${tableName}
+    for (def tablet in tablets) {
+        String tablet_id = tablet.TabletId
+        backend_id = tablet.BackendId
+        (code, out, err) = be_run_full_compaction(backendId_to_backendIP.get(backend_id), backendId_to_backendHttpPort.get(backend_id), tablet_id)
+        logger.info("Run compaction: code=" + code + ", out=" + out + ", err=" + err)
+        assertEquals(code, 0)
+        def compactJson = parseJson(out.trim())
+        assertEquals("success", compactJson.status.toLowerCase())
+    }
+
+    // wait for all compactions done
+    for (def tablet in tablets) {
+        Awaitility.await().atMost(10, TimeUnit.MINUTES).untilAsserted(() -> {
+            String tablet_id = tablet.TabletId
+            backend_id = tablet.BackendId
+            (code, out, err) = be_get_compaction_status(backendId_to_backendIP.get(backend_id), backendId_to_backendHttpPort.get(backend_id), tablet_id)
+            logger.info("Get compaction status: code=" + code + ", out=" + out + ", err=" + err)
+            assertEquals(code, 0)
+            def compactionStatus = parseJson(out.trim())
+            assertEquals("compaction task for this tablet is not running", compactionStatus.msg.toLowerCase())
+            return compactionStatus.run_status;
+        });
+    }
+
+    int afterSegmentCount = 0
+    for (def tablet in tablets) {
+        String tablet_id = tablet.TabletId
+        (code, out, err) = curl("GET", tablet.CompactionStatus)
+        logger.info("Show tablets status: code=" + code + ", out=" + out + ", err=" + err)
+        assertEquals(code, 0)
+        def tabletJson = parseJson(out.trim())
+        assert tabletJson.rowsets instanceof List
+        for (String rowset in (List<String>) tabletJson.rowsets) {
+            logger.info("rowset is: " + rowset)
+            afterSegmentCount += Integer.parseInt(rowset.split(" ")[1])
+        }
+    }
+    assertEquals(afterSegmentCount, 0)
+}