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Date: Tue, 26 Aug 2014 15:16:58 +0000 (UTC)
From: "Sylvain Lebresne (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Updated] (CASSANDRA-6599) CQL updates should support
 "column = column - { key1, key2, ... }" syntax for removing map elements
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     [ https://issues.apache.org/jira/browse/CASSANDRA-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne updated CASSANDRA-6599:
----------------------------------------

    Attachment: 6599-v2.txt

So looking back at the patch to support deletion by a set, I'm no sure of the reason for the changes to {{Sets.java}} but it make us incorrectly accept things like {{s = s + \{'a' : 'b'\}}} where {{s}} is a set (which triggers some AssertionError) and it breaks the empty map (as shown by the failure of the {{map_test}} in dtests). Attaching a v2 that remove those changes, pass the proper type when preparing the value in {{Operation.Substraction}} and a few additional tests.


> CQL updates should support "column = column - { key1, key2, ... }" syntax for removing map elements
> ---------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6599
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6599
>             Project: Cassandra
>          Issue Type: Wish
>            Reporter: Gavin
>            Assignee: Benjamin Lerer
>            Priority: Minor
>              Labels: cql
>             Fix For: 2.1.1
>
>         Attachments: 6599-proto.txt, 6599-v2.txt, CASSANDRA-6599.txt
>
>
> A variable number number of elements can be removed from lists and sets using an update statement of the form "update .... set column=column - {....} where ...".  This syntax should also be supported for map columns.  This would be especially useful for prepared statements (I know that you can use "set column[...] = null" to remove items in an update statement, but that only works for one element at a time).


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