[IMPALA-12589] NPE on querying external tables pointing to a single file

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 4.2.0, Impala 4.3.0
• Fix Version/s: Impala 4.4.0
• Component/s: Frontend
• Target Version: Impala 4.4.0
• Epic Color: ghx-label-11
• Assignee: Riza Suminto
• Reporter: Peter Rozsa
• Created: 01/Dec/23 17:03
• Updated: 16/Jul/24 23:42
• Resolved: 13/Dec/23 15:53

Description

IMPALA-11507 brought in changes for relative/absolute paths, and made it impossible to query external tables pointing to a single file. HdfsPartition.getPath() returns null instead of empty path during computeEstimatedTableSize().

Example:

create external table t1(c1 int) stored as textfile;
insert into t1 values (1);
show files in t1;
<copy the file to a tmp location>
<rm the LOCATION directory of t1>
<cp/mv the copied file to the LOCATION path>
invalidate metadata t1;
select count(*) from t1;