Timothy Miron created HIVE-17009:
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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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