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From "Elliot West (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-19896) Create view stores invalid, malformed version of original SQL text
Date Mon, 18 Jun 2018 08:50:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-19896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Elliot West updated HIVE-19896:
-------------------------------
    Target Version/s: 2.3.3, 3.0.1  (was: 2.3.3)

> Create view stores invalid, malformed version of original SQL text
> ------------------------------------------------------------------
>
>                 Key: HIVE-19896
>                 URL: https://issues.apache.org/jira/browse/HIVE-19896
>             Project: Hive
>          Issue Type: Bug
>          Components: Views
>    Affects Versions: 1.2.1, 2.3.0
>            Reporter: Elliot West
>            Priority: Major
>
> We perform additional processing on some of our view definitions and we've found that
in some cases Hive actually stores malformed representations of the original source SQL text
definition of the view. We have examples where the stored original view text is in fact an
unparsable statement. This prevents later processing of the view (recompiling for column adjustments
for example) and is counter intuitive to the user.
> Specifically the failure appears to be focused on the removal of necessary back-tick
quoting from the original text on aliases (but possibly other identifiers).
> h2. Steps to reproduce (abridged/formatted for clarity):
> Create a view that is subject to malformation:
> {code}
> hive> create view v as select * from (select 1) as `a.b`;
> OK
> {code}
> Describe view definition to obtain original text:
> {code}
> describe extended v;
> ...
> Detailed Table Information	Table(
>   tableName:v,
>   dbName:default,
>   viewOriginalText:select * from (select 1) as a.b,
>   viewExpandedText:select `a.b`.`_c0` from (select 1) as `a.b`,
>   tableType:VIRTUAL_VIEW)
> {code}
> Note that {{viewOriginalText}} value does not equal the text supplied on the first step,
specifically {{`a.b`}} → {{a.b}}.
> Executing {{viewOriginalText}} value results in failure:
> {code}
> hive> select * from (select 1) as a.b;
> NoViableAltException(17@[215:51: ( KW_AS )?])
> 	at org.antlr.runtime.DFA.noViableAlt(DFA.java:158)
> ...
> FAILED: ParseException line 1:29 cannot recognize input near 'as' 'a' '.' in subquery
source
> {code}



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