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https://issues.apache.org/jira/browse/CASSANDRA-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16637631#comment-16637631
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Dmitry Lazurkin edited comment on CASSANDRA-14706 at 10/3/18 11:48 PM:
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RDBMS has DDL-transactions. So this is not so crucial for it. But C* migrations
aren't so comfortable without this feature. If you have up-migration with many
statements then you can't restart up-migration after error in middle and you
can't start down-migration. You need manual revert of all statement before
error.
was (Author: dmitry.lazurkin):
RDBMS have DDL-transactions. So this is not so crucial for it. But C*
migrations aren't so comfortable without this feature. If you have up-migration
with many statements then you can't restart up-migration after error in middle
and you can't start down-migration. You need manual revert of all statement
before error.
> 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
> 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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