[ 
https://issues.apache.org/jira/browse/HIVE-23688?focusedWorklogId=642300&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-642300
 ]

ASF GitHub Bot logged work on HIVE-23688:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 26/Aug/21 12:19
            Start Date: 26/Aug/21 12:19
    Worklog Time Spent: 10m 
      Work Description: abstractdog commented on a change in pull request #2479:
URL: https://github.com/apache/hive/pull/2479#discussion_r696573989



##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/VectorizedListColumnReader.java
##########
@@ -479,6 +501,9 @@ private boolean compareBytesColumnVector(BytesColumnVector 
cv1, BytesColumnVecto
     int length2 = cv2.vector.length;
     if (length1 == length2) {
       for (int i = 0; i < length1; i++) {
+        if (cv1.vector[i] == null && cv2.vector[i] == null) {
+          continue;

Review comment:
       I think I got it, it will be much faster for non-null strings:
   ```
           int innerLen1 = cv1.vector[i].length;
           int innerLen2 = cv2.vector[i].length;
           if (innerLen1 == innerLen2) {
             for (int j = 0; j < innerLen1; j++) {
               if (cv1.vector[i][j] != cv2.vector[i][j]) {
                 return false;
               }
             }
           } else {
             return false;
           }
           
           if (cv1.isNull[i] && cv2.isNull[i]) {
             continue;
           }
   ```




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 642300)
    Time Spent: 3h 20m  (was: 3h 10m)

> Vectorization: IndexArrayOutOfBoundsException For map type column which 
> includes null value
> -------------------------------------------------------------------------------------------
>
>                 Key: HIVE-23688
>                 URL: https://issues.apache.org/jira/browse/HIVE-23688
>             Project: Hive
>          Issue Type: Bug
>          Components: Parquet, storage-api, Vectorization
>    Affects Versions: All Versions
>            Reporter: 范宜臻
>            Assignee: László Bodor
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 3.0.0, 4.0.0
>
>         Attachments: HIVE-23688.patch
>
>          Time Spent: 3h 20m
>  Remaining Estimate: 0h
>
> {color:#de350b}start{color} and {color:#de350b}length{color} are empty arrays 
> in MapColumnVector.values(BytesColumnVector) when values in map contain 
> {color:#de350b}null{color}
> reproduce in master branch:
> {code:java}
> set hive.vectorized.execution.enabled=true; 
> CREATE TABLE parquet_map_type (id int,stringMap map<string, string>) 
> stored as parquet; 
> insert overwrite table parquet_map_typeSELECT 1, MAP('k1', null, 'k2', 
> 'bar'); 
> select id, stringMap['k1'] from parquet_map_type group by 1,2;
> {code}
> query explain:
> {code:java}
> Stage-0
>   Fetch Operator
>     limit:-1
>     Stage-1
>       Reducer 2 vectorized
>       File Output Operator [FS_12]
>         Group By Operator [GBY_11] (rows=5 width=2)
>           Output:["_col0","_col1"],keys:KEY._col0, KEY._col1
>         <-Map 1 [SIMPLE_EDGE] vectorized
>           SHUFFLE [RS_10]
>             PartitionCols:_col0, _col1
>             Group By Operator [GBY_9] (rows=10 width=2)
>               Output:["_col0","_col1"],keys:_col0, _col1
>               Select Operator [SEL_8] (rows=10 width=2)
>                 Output:["_col0","_col1"]
>                 TableScan [TS_0] (rows=10 width=2)
>                   
> temp@parquet_map_type_fyz,parquet_map_type_fyz,Tbl:COMPLETE,Col:NONE,Output:["id","stringmap"]
> {code}
> runtime error:
> {code:java}
> Vertex failed, vertexName=Map 1, vertexId=vertex_1592040015150_0001_3_00, 
> diagnostics=[Task failed, taskId=task_1592040015150_0001_3_00_000000, 
> diagnostics=[TaskAttempt 0 failed, info=[Error: Error while running task ( 
> failure ) : 
> attempt_1592040015150_0001_3_00_000000_0:java.lang.RuntimeException: 
> java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: 
> Hive Runtime Error while processing row 
>       at 
> org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:296)
>       at 
> org.apache.hadoop.hive.ql.exec.tez.TezProcessor.run(TezProcessor.java:250)
>       at 
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:374)
>       at 
> org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:73)
>       at 
> org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:61)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:422)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
>       at 
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:61)
>       at 
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:37)
>       at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
>       at 
> com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:108)
>       at 
> com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:41)
>       at 
> com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:77)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.RuntimeException: 
> org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while 
> processing row 
>       at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.processRow(MapRecordSource.java:101)
>       at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.pushRecord(MapRecordSource.java:76)
>       at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.run(MapRecordProcessor.java:403)
>       at 
> org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:267)
>       ... 16 more
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime 
> Error while processing row 
>       at 
> org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:970)
>       at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.processRow(MapRecordSource.java:92)
>       ... 19 more
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Error evaluating 
> id
>       at 
> org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.process(VectorSelectOperator.java:149)
>       at 
> org.apache.hadoop.hive.ql.exec.Operator.vectorForward(Operator.java:918)
>       at 
> org.apache.hadoop.hive.ql.exec.TableScanOperator.process(TableScanOperator.java:172)
>       at 
> org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.deliverVectorizedRowBatch(VectorMapOperator.java:809)
>       at 
> org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:842)
>       ... 20 more
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
>       at 
> org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector.setElement(BytesColumnVector.java:506)
>       at 
> org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFMapIndexBaseScalar.evaluate(VectorUDFMapIndexBaseScalar.java:83)
>       at 
> org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.process(VectorSelectOperator.java:146)
>       ... 24 more
> {code}



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