[Fix][MongoDB] The Long type cannot handle string values in scientific notation (#8783)

Author: qifanlili

seatunnel-connectors-v2/connector-mongodb/src/main/java/org/apache/seatunnel/connectors/seatunnel/mongodb/source/split/SamplingSplitStrategy.java

@@ -17,6 +17,7 @@
 
 package org.apache.seatunnel.connectors.seatunnel.mongodb.source.split;
 
+import org.apache.seatunnel.shade.com.google.common.annotations.VisibleForTesting;
 import org.apache.seatunnel.shade.com.google.common.base.Preconditions;
 import org.apache.seatunnel.shade.com.google.common.collect.Lists;
 
@@ -33,6 +34,7 @@
 import com.mongodb.client.model.Sorts;
 
 import java.io.Serializable;
+import java.math.BigDecimal;
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
@@ -103,7 +105,8 @@ public List<MongoSplit> split() {
         return createSplits(splitKey, rightBoundaries);
     }
 
-    private ImmutablePair<Long, Long> getDocumentNumAndAvgSize() {
+    @VisibleForTesting
+    protected ImmutablePair<Long, Long> getDocumentNumAndAvgSize() {
         String collectionName =
                 clientProvider.getDefaultCollection().getNamespace().getCollectionName();
         BsonDocument statsCmd = new BsonDocument("collStats", new BsonString(collectionName));
@@ -112,7 +115,7 @@ private ImmutablePair<Long, Long> getDocumentNumAndAvgSize() {
         // fix issue https://github.com/apache/seatunnel/issues/7575
         long total =
                 Optional.ofNullable(count)
-                        .map(v -> Long.parseLong(String.valueOf(count)))
+                        .map(v -> new BigDecimal(String.valueOf(count)).longValue())
                         .orElse(0L);
         Object avgDocumentBytes = res.get("avgObjSize");
         long avgObjSize =

seatunnel-connectors-v2/connector-mongodb/src/test/java/org/apache/seatunnel/connectors/seatunnel/mongodb/source/split/SamplingSplitStrategyTest.java

@@ -0,0 +1,74 @@
+/*
+ * 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.seatunnel.connectors.seatunnel.mongodb.source.split;
+
+import org.apache.seatunnel.connectors.seatunnel.mongodb.internal.MongodbClientProvider;
+
+import org.apache.commons.lang3.tuple.ImmutablePair;
+
+import org.bson.BsonDocument;
+import org.bson.BsonString;
+import org.bson.Document;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import com.mongodb.MongoNamespace;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.when;
+
+public class SamplingSplitStrategyTest {
+
+    @Mock private MongodbClientProvider clientProvider;
+
+    @Mock private MongoCollection<BsonDocument> collection;
+
+    @Mock private MongoDatabase database;
+
+    private SamplingSplitStrategy strategy;
+
+    @BeforeEach
+    public void setUp() {
+        MockitoAnnotations.openMocks(this);
+        strategy = new SamplingSplitStrategy(clientProvider, "splitKey", null, null, 100L, 1000L);
+        when(clientProvider.getDefaultCollection()).thenReturn(collection);
+        when(clientProvider.getDefaultDatabase()).thenReturn(database);
+
+        MongoNamespace namespace = new MongoNamespace("databaseName", "collectionName");
+        when(collection.getNamespace()).thenReturn(namespace);
+    }
+
+    @Test
+    public void testGetDocumentNumAndAvgSize() {
+        BsonDocument statsCmd = new BsonDocument("collStats", new BsonString("collectionName"));
+        Document res = new Document();
+        res.put("count", "1.3360484963E10");
+        res.put("avgObjSize", 200.0);
+
+        when(database.runCommand(statsCmd)).thenReturn(res);
+
+        ImmutablePair<Long, Long> result = strategy.getDocumentNumAndAvgSize();
+
+        assertEquals(Long.valueOf(13360484963L), result.getLeft());
+        assertEquals(Long.valueOf(200), result.getRight());
+    }
+}