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https://issues.apache.org/jira/browse/CASSANDRA-17190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17458026#comment-17458026
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Benjamin Lerer commented on CASSANDRA-17190:
--------------------------------------------
{quote}
So to understand correctly, this would enable users to write queries like:
'Select col1 + col2 from....'
{quote}
Yes or {{SELECT col1 + '-' + col2 FROM ...}}
The method signature looks good. You can probably even make it a full method
rather than an abstract one.
> Add support for String contatenation through the "+" operator
> -------------------------------------------------------------
>
> Key: CASSANDRA-17190
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17190
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Interpreter
> Reporter: Benjamin Lerer
> Assignee: Manish Ghildiyal
> Priority: Normal
> Labels: AdventCalendar2021, lhf
> Fix For: 4.x
>
>
> Since 4.0, Cassandra support operations on numeric types and on some temporal
> types.
> We should add support for string concatenations through the {{+}} operator.
> +Additional information for newcomers:+
> Cassandra has 2 string types: {{Text}} ({{UTF8Type}}) and ascii
> ({{AsciiType}}) both are sub-classes of ({{StringType}}). In order to add
> support for string concatenation you will need to add a new method to
> {{StringType}} and modify {{OperationFcts}} to add the new functions (one for
> each combination of types: ascii/ascii, ascii/text, text/ascii and text/text).
> The unit test should be added to {{OperationFctsTest}}.
> To allow for concatenating constants (eg: SELECT v1 + ' ' + v2 FROM ...) you
> will need to add a {{getPreferedTypeFor}} method to
> {{org.apache.cassandra.Constants.Type.STRING}} that determine the constant
> type based on its content (ascii or not).
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