[jira] [Created] (HIVE-17009) ifnull() compatibility with explain or use of constants

["Timothy Miron (JIRA)" <ji...@apache.org>]

Timothy Miron created HIVE-17009:
------------------------------------

             Summary: ifnull() compatibility with explain or use of constants
                 Key: HIVE-17009
                 URL: https://issues.apache.org/jira/browse/HIVE-17009
             Project: Hive
          Issue Type: Bug
          Components: Hive, SQL
    Affects Versions: 1.2.1
         Environment: Running hive queries from Toad Data Point 4.2 via ODBC connection.
            Reporter: Timothy Miron


Error "Invalid function 'nullif'" thrown if nullif() used in conjunction with certain other commands, but equivalently behaving  CASE WHEN ... END block behaves fine.

Example:
(note the use of `dual` table)

# This throws an {color:#ff0000}"Invalid function 'nullif'" error{color}:
{code:sql}
select
 coalesce(nullif('a','a'),'b') result_value 
from
workspace_t886880.dual
where current_date > date_sub(current_date,1); 
{code}

As well as simply attaching 'EXPLAIN' like this:
{code:sql}
EXPLAIN select
 coalesce(nullif('a','a'),'b') result_value 
from
workspace_t886880.dual
{code}

# This similarily behaving CASE..WHEN block does {color:#14892c}not{color} throw an error:
{code:sql}
select
 coalesce(case when 'a' = 'a' then null else 'a' end,'b') result_value
from
workspace_t886880.dual
where current_date > date_sub(current_date,1);
{code}

Similarly, omitting any where clause returns functionality to normal, as does removing any _operations _from the where clause also {color:#14892c}allows {color}the query to execute:
{code:sql}
/* this works */
select
 coalesce(nullif('a','a'),'b') result_value 
from
workspace_t886880.dual;
/* no where clause! */

/* and this works too */
select
 coalesce(nullif('a','a'),'b') result_value 
from
workspace_t886880.dual
where DATE '2016-01-02' > DATE '2016-01-01'
{code}



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