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From "paul cannon (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4488) update cqlsh recognized syntax (for tab completion, etc)
Date Wed, 26 Sep 2012 19:27:08 GMT


paul cannon commented on CASSANDRA-4488:

The machinery needs to be able to parse an entire line up to the completion point, or it has
no way of knowing what the context is. Since many people have reported cqlsh's context-sensitive
completion of things like columnfamily properties and possible values as useful, cqlsh needs
to be able to recognize that map literals are valid property values, etc. Cqlsh also needs
to know that composite row keys are possible or it wouldn't be able to figure out when a CREATE
TABLE statement's column definitions were done and when the options are supposed to come.

>From a different direction, cqlsh is supposed to be able to DESCRIBE keyspaces and tables
using current, valid syntax. People complain and write bug reports when they copy and paste
DESCRIBE output and they get an error. So, the DESCRIBE machinery also needs to know how to
show options in the map format and when to use the old syntax instead.

I have a pretty huge patch toward this end already, which not only allows parsing the new
syntax, but also recognizes when it should be used versus the old syntax (3.0.0-beta1 for
cassandra-1.1 servers), updates cqlsh's idea of what properties are valid and how they look
('compaction' as a map for 1.2 vs 'compaction_strategy_options' as a prefix for 1.1, etc),
updates DESCRIBE KEYSPACE and DESCRIBE TABLE, adds hints to INSERT and UPDATE statements to
let the user know what type is expected in a particular value position, and starts using schema_columnfamilies
to get the list of available column names in certain cases since thrift doesn't report all
of them anymore.

The only thing I have left to add there is the GRANT and REVOKE statements from CASSANDRA-4490,
which should be pretty straightforward. I can attach what I have so far if you'd rather have
Aleksey finish it off.
> update cqlsh recognized syntax (for tab completion, etc)
> --------------------------------------------------------
>                 Key: CASSANDRA-4488
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: paul cannon
>            Assignee: Aleksey Yeschenko
>            Priority: Minor
>             Fix For: 1.1.6
> cqlsh syntax awareness (tab completion, etc) should be aware of several recent changes
to CQL:
>  * CASSANDRA-4179 (row key and column value composites; 1.2 only)
>  * CASSANDRA-3647 (sets/lists/maps; 1.2 only)
>  * CASSANDRA-4018 (inet type; 1.2 only)
>  * CASSANDRA-4278 (hyphens in keyspace properties; 1.1 and up)
>  * CASSANDRA-4217 (accessing ttl, timestamp; 1.1 and up)

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