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https://issues.apache.org/jira/browse/CASSANDRA-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-14706:
-----------------------------------------
    Component/s: CQL

> Support "IF EXISTS/IF NOT EXISTS" for all clauses of "ALTER TABLE"
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-14706
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14706
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: CQL
>            Reporter: Dmitry Lazurkin
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Like so:
> {noformat}
> ALTER TABLE <table> ALTER <column> TYPE <newtype>;
> ALTER TABLE [ IF EXISTS ] <table> ADD [ IF NOT EXISTS ] <coumn> <newtype>;
> ALTER TABLE [ IF EXISTS ] <table> ADD [ IF NOT EXISTS ] (<column> 
> <newtype>,<column1> <newtype1>..... <column n> <newtype n>);
> ALTER TABLE [ IF EXISTS ] <table> DROP [ IF EXISTS ] <column>;
> ALTER TABLE [ IF EXISTS ] <table> DROP [ IF EXISTS ] ( 
> <column>,<column1>.....<column n>);
> ALTER TABLE [ IF EXISTS ] <table> RENAME [ IF EXISTS ] <column> TO <column>;
> ALTER TABLE [ IF EXISTS ] <table> WITH <property> = <value>;
> {noformat}
> I think common IF EXISTS/IF NOT EXISTS clause for ADD/DROP/RENAME better than 
> clause for each column.



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