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https://issues.apache.org/jira/browse/CASSANDRA-17184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454022#comment-17454022
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Aleksandr Volochnev commented on CASSANDRA-17184:
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Hi [~blerer], this task looks like a good starting point for me. I'll start
working on it tonight if there is no one assigned already.
Thank you for the detailed description, it helps a lot.
> Add += and -= syntax to ALTER TABLE WITH
> ----------------------------------------
>
> Key: CASSANDRA-17184
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17184
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Syntax
> Reporter: Benjamin Lerer
> Priority: Normal
> Labels: AdventCalendar2021, lhf
> Fix For: 4.x
>
>
> We have 2 types of table properties in CQL: simple ones (comment,
> gc_grace_seconds, ...), which are basically of type text (even if, we
> historically allow constants of any type) and complex ones (compaction,
> caching...), which are basically map<text, text>.
> The only syntax that {{ALTER TABLE WITH}} supports is of setting a property,
> and so for the later kind, we basically always have to provide the new full
> map for the option. To take an example, say you have a table with compaction
> and want to enable compaction logging you will have to provide the all map.
> In order to avoid that problem we can add support for the {{+=}} (and {{-=}}
> ideally) syntax that already exists for maps otherwise, and support:
> {code}
> ALTER TABLE t WITH compaction+= { 'log_all' : 'true' }
> {code}
> +Additional info for newcomers:+
> In order to implement this change you will need to change the Parser.g ANTLR
> file located in the src/antlr directory and the java classes corresponding to
> the different alter statements located in the
> {{org.apache.cassandra.cql3.statements.schema}} package.
> The unit test for the CQL logic are located under
> {{org.apache.cassandra.cql3.validation}}
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