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Posted to issues@spark.apache.org by "Volodymyr Glushak (JIRA)" <ji...@apache.org> on 2018/05/30 16:11:00 UTC
[jira] [Commented] (SPARK-24430) CREATE VIEW with UNION statement:
Failed to recognize predicate 'UNION'.
[ https://issues.apache.org/jira/browse/SPARK-24430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495374#comment-16495374 ]
Volodymyr Glushak commented on SPARK-24430:
-------------------------------------------
I wonder, if that is legal code, and this request should be moved to HIVE JIRA.
> 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
> Priority: Major
>
> 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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