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https://issues.apache.org/jira/browse/DRILL-4185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16319199#comment-16319199
 ] 

ASF GitHub Bot commented on DRILL-4185:
---------------------------------------

Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1083#discussion_r160525590
  
    --- Diff: 
exec/java-exec/src/test/java/org/apache/drill/exec/store/parquet/TestParquetGroupScan.java
 ---
    @@ -56,65 +56,50 @@ private void prepareTables(final String tableName, 
boolean refreshMetadata) thro
       public void testFix4376() throws Exception {
         prepareTables("4376_1", true);
     
    -    testBuilder()
    -      .sqlQuery("SELECT COUNT(*) AS `count` FROM dfs.tmp.`4376_1/60*`")
    -      .ordered()
    -      .baselineColumns("count").baselineValues(1984L)
    -      .go();
    +    int actualRecordCount = testSql("SELECT * FROM dfs.tmp.`4376_1/60*`");
    +    int expectedRecordCount = 1984;
    +    assertEquals(String.format("Received unexpected number of rows in 
output: expected=%d, received=%s",
    --- End diff --
    
    `expected=%d` -> `expected = %d`. Please correct here and in other cases.
      


> UNION ALL involving empty directory on any side of union all results in 
> Failed query
> ------------------------------------------------------------------------------------
>
>                 Key: DRILL-4185
>                 URL: https://issues.apache.org/jira/browse/DRILL-4185
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>    Affects Versions: 1.4.0
>            Reporter: Khurram Faraaz
>            Assignee: Vitalii Diravka
>
> UNION ALL query that involves an empty directory on either side of UNION ALL 
> operator results in FAILED query. We should return the results for the 
> non-empty side (input) of UNION ALL.
> Note that empty_DIR is an empty directory, the directory exists, but it has 
> no files in it. 
> Drill 1.4 git.commit.id=b9068117
> 4 node cluster on CentOS
> {code}
> 0: jdbc:drill:schema=dfs.tmp> select columns[0] from empty_DIR UNION ALL 
> select cast(columns[0] as int) c1 from `testWindow.csv`;
> Error: VALIDATION ERROR: From line 1, column 24 to line 1, column 32: Table 
> 'empty_DIR' not found
> [Error Id: 5c024786-6703-4107-8a4a-16c96097be08 on centos-01.qa.lab:31010] 
> (state=,code=0)
> 0: jdbc:drill:schema=dfs.tmp> select cast(columns[0] as int) c1 from 
> `testWindow.csv` UNION ALL select columns[0] from empty_DIR;
> Error: VALIDATION ERROR: From line 1, column 90 to line 1, column 98: Table 
> 'empty_DIR' not found
> [Error Id: 58c98bc4-99df-425c-aa07-c8c5faec4748 on centos-01.qa.lab:31010] 
> (state=,code=0)
> {code}



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