[HUDI-1719] hive on spark/mr,Incremental query of the mor table, the partition field is incorrect (#2720)

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/AbstractRealtimeRecordReader.java

@@ -147,4 +147,12 @@ public abstract class AbstractRealtimeRecordReader {
   public Schema getHiveSchema() {
     return hiveSchema;
   }
+
+  public RealtimeSplit getSplit() {
+    return split;
+  }
+
+  public JobConf getJobConf() {
+    return jobConf;
+  }
 }

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/HoodieCombineRealtimeRecordReader.java

@@ -22,6 +22,7 @@ import org.apache.hudi.common.util.ValidationUtils;
 import org.apache.hudi.hadoop.hive.HoodieCombineRealtimeFileSplit;
 import org.apache.hudi.hadoop.utils.HoodieRealtimeRecordReaderUtils;
 
+import org.apache.hadoop.hive.ql.io.IOContextMap;
 import org.apache.hadoop.io.ArrayWritable;
 import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.mapred.InputSplit;
@@ -71,6 +72,9 @@ public class HoodieCombineRealtimeRecordReader implements RecordReader<NullWrita
     } else if (recordReaders.size() > 0) {
       this.currentRecordReader.close();
       this.currentRecordReader = recordReaders.remove(0);
+      AbstractRealtimeRecordReader reader = (AbstractRealtimeRecordReader)currentRecordReader.getReader();
+      // when switch reader, ioctx should be updated
+      IOContextMap.get(reader.getJobConf()).setInputPath(reader.getSplit().getPath());
       return next(key, value);
     } else {
       return false;

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/HoodieRealtimeRecordReader.java

@@ -103,4 +103,8 @@ public class HoodieRealtimeRecordReader implements RecordReader<NullWritable, Ar
   public float getProgress() throws IOException {
     return this.reader.getProgress();
   }
+
+  public RecordReader<NullWritable, ArrayWritable> getReader() {
+    return this.reader;
+  }
 }