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From "Simanchal Das (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15229) 'like any' and 'like all' operators in hive
Date Thu, 02 Mar 2017 15:27:45 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Simanchal Das updated HIVE-15229:
---------------------------------
    Attachment: HIVE-15229.5.patch

> 'like any' and 'like all' operators in hive
> -------------------------------------------
>
>                 Key: HIVE-15229
>                 URL: https://issues.apache.org/jira/browse/HIVE-15229
>             Project: Hive
>          Issue Type: New Feature
>          Components: Operators
>            Reporter: Simanchal Das
>            Assignee: Simanchal Das
>            Priority: Minor
>         Attachments: HIVE-15229.1.patch, HIVE-15229.2.patch, HIVE-15229.3.patch, HIVE-15229.4.patch,
HIVE-15229.5.patch
>
>
> In Teradata 'like any' and 'like all' operators are mostly used when we are matching
a text field with numbers of patterns.
> 'like any' and 'like all' operator are equivalents of multiple like operator like example
below.
> {noformat}
> --like any
> select col1 from table1 where col2 like any ('%accountant%', '%accounting%', '%retail%',
'%bank%', '%insurance%');
> --Can be written using multiple like condition 
> select col1 from table1 where col2 like '%accountant%' or col2 like '%accounting%' or
col2 like '%retail%' or col2 like '%bank%' or col2 like '%insurance%' ;
> --like all
> select col1 from table1 where col2 like all ('%accountant%', '%accounting%', '%retail%',
'%bank%', '%insurance%');
> --Can be written using multiple like operator 
> select col1 from table1 where col2 like '%accountant%' and col2 like '%accounting%' and
col2 like '%retail%' and col2 like '%bank%' and col2 like '%insurance%' ;
> {noformat}
> Problem statement:
> Now a days so many data warehouse projects are being migrated from Teradata to Hive.
> Always Data engineer and Business analyst are searching for these two operator.
> If we introduce these two operator in hive then so many scripts will be migrated smoothly
instead of converting these operators to multiple like operators.
> Result:
> 1. 'LIKE ANY' operator return true if a text(column value) matches to any pattern.
> 2. 'LIKE ALL' operator return true if a text(column value) matches to all patterns.
> 3. 'LIKE ANY' and 'LIKE ALL' returns NULL not only if the expression on the left hand
side is NULL, but also if one of the pattern in the list is NULL.



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