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https://issues.apache.org/jira/browse/CASSANDRA-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14080869#comment-14080869
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Aleksey Yeschenko commented on CASSANDRA-6599:
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After thinking about it for a while, I'm not sure I like accepting set literals
for map operations.
I personally would prefer allowing nulls as values in map literals, so that you
could do something like this instead, without inventing new syntax:
{code}
update table set map = map + {'key1': null, 'key2': null} where ...
{code}
I believe this already works with prepared statements, as is, but could be
wrong.
> 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: 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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