Benjamin Lerer created CASSANDRA-17184:
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Summary: 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
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.
+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}}
In order to avoid that problem we can add support for the {{+=}} (and {{-=}}
ideally) syntax that already exists for maps otherwise, and support:
{{ALTER TABLE t WITH compaction+= \{ 'log_all' : 'true' \}}}
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