[HIVE-22360] MultiDelimitSerDe returns wrong results in last column when the loaded file has more columns than those in table schema

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0-alpha-1
• Component/s: Serializers/Deserializers
• Labels: pull-request-available
• Assignee: Shubham Chaurasia
• Reporter: Shubham Chaurasia
• Created: 17/Oct/19 07:26
• Updated: 01/Dec/22 09:00
• Resolved: 24/Oct/19 04:29

Description

Repro steps:

Input file:

1^,1^,^,0^,0^,0 
2^,1^,^,0^,1^,0 
3^,1^,^,0^,0^,0 
4^,1^,^,0^,1^,0

Queries:

CREATE TABLE  n2(colA int, colB tinyint, colC timestamp, colD smallint, colE smallint) ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.MultiDelimitSerDe' WITH SERDEPROPERTIES ("field.delim"="^,")STORED AS TEXTFILE;

LOAD DATA LOCAL INPATH '/Users/schaurasia/Documents/input_6_cols.csv' OVERWRITE INTO TABLE n2;

 select * from n2;
// wrong last column results here.
+----------+----------+----------+----------+----------+
| n2.cola  | n2.colb  | n2.colc  | n2.cold  | n2.cole  |
+----------+----------+----------+----------+----------+
| 1        | 1        | NULL     | 0        | NULL     |
| 2        | 1        | NULL     | 0        | NULL     |
| 3        | 1        | NULL     | 0        | NULL     |
| 4        | 1        | NULL     | 0        | NULL     |
+----------+----------+----------+----------+----------+

Cause:
In multi-serde parsing, the total length calculation here: https://github.com/apache/hive/blob/rel/release-3.1.2/serde/src/java/org/apache/hadoop/hive/serde2/lazy/LazyStruct.java#L308 does not take extra fields into account.

Issue Links

• causes: HIVE-24151 MultiDelimitSerDe shifts data if strings contain non-ASCII characters
• Is contained by: HIVE-26751 Bug Fixes and Improvements for 3.2.0 release
• is related to: HIVE-22337 Improve and Expand Text-Based SerDes
• links to: GitHub Pull Request #823