[jira] [Created] (DRILL-5622) DISTINCT predicate generates invalid SQL for a JDBC data source such as ORACLE

[N Campbell (JIRA)]

N Campbell created DRILL-5622:
---------------------------------

             Summary: DISTINCT predicate generates invalid SQL for a JDBC data 
source such as ORACLE
                 Key: DRILL-5622
                 URL: https://issues.apache.org/jira/browse/DRILL-5622
             Project: Apache Drill
          Issue Type: Bug
          Components:  Server
    Affects Versions: 1.10.0
         Environment: ORACLE 12
Apache Drill 1.10
            Reporter: N Campbell


The SQL generated by DRILL to a database such as ORACLE is inavlid

SELECT RNUM, TINT.CINT FROM certora.DBCERT.TINT WHERE TINT.CINT IS DISTINCT 
FROM 1

DATA_READ ERROR: The JDBC storage plugin failed while trying setup the SQL 
query. 

SELECT *
FROM "DBCERT"."TINT"
WHERE CAST(CASE WHEN "CINT" IS NULL THEN 1 IS NOT NULL WHEN 1 IS NULL THEN 
"CINT" IS NOT NULL ELSE "CINT" <> 1 END AS BOOLEAN)
plugin certora
Fragment 0:0



 CREATE TABLE "DBCERT"."TINT" 
   (    "RNUM" NUMBER, 
        "CINT" NUMBER(9,0)
   ) ;

Insert into DBCERT.TINT (RNUM,CINT) values (0,null);
Insert into DBCERT.TINT (RNUM,CINT) values (1,-1);
Insert into DBCERT.TINT (RNUM,CINT) values (2,0);
Insert into DBCERT.TINT (RNUM,CINT) values (3,1);
Insert into DBCERT.TINT (RNUM,CINT) values (4,10);



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