Benjamin Lerer created CASSANDRA-16916:
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Summary: Add support for IF EXISTS and IF NOT EXISTS in ALTER
statements
Key: CASSANDRA-16916
URL: https://issues.apache.org/jira/browse/CASSANDRA-16916
Project: Cassandra
Issue Type: Improvement
Components: CQL/Syntax
Reporter: Benjamin Lerer
It would make sense to add support for {{IF EXISTS}} and {{IF NOT EXISTS}} in
the different {{ALTER}} statements.
For example:
* {{ALTER TABLE IF EXISTS myTable ...}}
* {{ALTER TABLE myTable ADD IF NOT EXISTS ...}}
* {{ALTER TABLE myTable DROP IF EXISTS ...}}
* {{ALTER TYPE IF EXISTS myType ...}}
* {{ALTER TYPE myType ADD IF NOT EXISTS ...}}
+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. You can look at the
CreateTableStatement class to see how it was done there.
The unit test for the CQL logic are located under
{{org.apache.cassandra.cql3.validation}}
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