[jira] [Commented] (DRILL-5851) Empty table during a join operation with a non empty table produces cast exception

[ASF GitHub Bot (JIRA)]

    [ 
https://issues.apache.org/jira/browse/DRILL-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16319306#comment-16319306
 ] 

ASF GitHub Bot commented on DRILL-5851:
---------------------------------------

Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1059#discussion_r160542798
  
    --- Diff: 
exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/join/TestNestedLoopJoin.java
 ---
    @@ -333,4 +339,55 @@ public void testNlJoinWithLargeRightInputSuccess() 
throws Exception {
           test(RESET_JOIN_OPTIMIZATION);
         }
       }
    +
    +  private static void buildFile(String fileName, String[] data, File 
testDir) throws IOException {
    +    try(PrintWriter out = new PrintWriter(new FileWriter(new File(testDir, 
fileName)))) {
    +      for (String line : data) {
    +        out.println(line);
    +      }
    +    }
    +  }
    +
    +  public static void testWithEmptyJoin(File testDir, String joinType,
    +                                String joinPattern, long result) throws 
Exception {
    +    buildFile("dept.json", new String[0], testDir);
    +    String query = String.format(testEmptyJoin, joinType);
    +    testPlanMatchingPatterns(query, new String[]{joinPattern}, new 
String[]{});
    +    testBuilder()
    +            .sqlQuery(query)
    +            .unOrdered()
    +            .baselineColumns("cnt")
    +            .baselineValues(result)
    +            .build().run();
    +  }
    +
    +  @Test
    +  public void testNestedLeftJoinWithEmptyTable() throws Exception {
    +    try {
    +      test(DISABLE_NLJ_SCALAR);
    +      testWithEmptyJoin(dirTestWatcher.getRootDir(), "left outer", 
nlpattern, 1155L);
    +    } finally {
    +      test(RESET_HJ);
    --- End diff --
    
    Please use `client.resetSessionOption(...)`.


> Empty table during a join operation with a non empty table produces cast 
> exception 
> -----------------------------------------------------------------------------------
>
>                 Key: DRILL-5851
>                 URL: https://issues.apache.org/jira/browse/DRILL-5851
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>    Affects Versions: 1.11.0
>            Reporter: Hanumath Rao Maduri
>            Assignee: Hanumath Rao Maduri
>
> Hash Join operation on tables with one table empty and the other non empty 
> throws an exception 
> {code} 
> Error: SYSTEM ERROR: DrillRuntimeException: Join only supports implicit casts 
> between 1. Numeric data
>  2. Varchar, Varbinary data 3. Date, Timestamp data Left type: VARCHAR, Right 
> type: INT. Add explicit casts to avoid this error
> {code}
> Here is an example query with which it is reproducible.
> {code}
> select * from cp.`sample-data/nation.parquet` nation left outer join 
> dfs.tmp.`2.csv` as two on two.a = nation.`N_COMMENT`;
> {code}
> the contents of 2.csv is empty (i.e not even header info).



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