Volodymyr Glushak created SPARK-24430:
-----------------------------------------
Summary: CREATE VIEW with UNION statement: Failed to recognize
predicate 'UNION'.
Key: SPARK-24430
URL: https://issues.apache.org/jira/browse/SPARK-24430
Project: Spark
Issue Type: Request
Components: Spark Core, SQL
Affects Versions: 2.2.1
Reporter: Volodymyr Glushak
When I executes following SQL statement:
{code}
spark.sql('CREATE VIEW view_12 AS
SELECT * FROM (
SELECT * FROM table1
UNION ALL
SELECT * FROM table2
) UT')
{code}
It successfully creates view in HIVE, which I can query via Apache Spark.
However if I'm trying to query the same view directly via HIVE, I've got an
error:
{code}
org.apache.hive.service.cli.HiveSQLException: Error while compiling statement:
FAILED: ParseException line 6:6 Failed to recognize predicate 'UNION'.
Failed rule: 'identifier' in subquery source
{code}
*Investigation*
Under hood, spark generate following SQL statement for this view:
{code}
CREATE VIEW `view_12` AS
SELECT *
FROM (SELECT * FROM
(
(SELECT * FROM (SELECT * FROM `db1`.`table1`) AS
gen_subquery_0)
UNION ALL
(SELECT * FROM (SELECT * FROM `db1`.`tabl2`) AS
gen_subquery_1)
) AS UT
) AS UT
{code}
If I try to executes this statement in HIVE it fails with the same reason.
The easiest way to fix it, is to unwrap outer queries on lines 5 and 7.
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