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https://issues.apache.org/jira/browse/HIVE-15229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simanchal Das updated HIVE-15229:
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Attachment: HIVE-15229.4.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
>
>
> 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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