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https://issues.apache.org/jira/browse/CASSANDRA-8488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231722#comment-15231722
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Henry Manasseh edited comment on CASSANDRA-8488 at 4/8/16 6:40 AM:
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It seems the UDF could be wrapped by a subclass of CustomExpression (or the new
UserExpression) let's say UDTWrappedExpression which returns a boolean and
injects the wrapped expression into the RowFilter. Would that work as a
starting point for the design?
For the CQL changes: would something like this work for the syntax?
select * from my_table where my_filter_udf(col1, col2, 'some constraint defined
as an UDF parameter - text or list<text>, etc.')
For the constraint, the UDF would need to be extended to support literals
(CASSANDRA-10783).
Is that in line with what you were thinking [~jbellis]?
was (Author: henryman):
It seems the UDF could be wrapped by a subclass of CustomExpression (or the new
UserExpression) let's say UDTWrappedExpression which returns a boolean and
injects the wrapped expression into the RowFilter. Would that work as a
starting point for the design?
For the CQL changes: would something like this work for the syntax?
select * from my_table where my_filter_udf(col1, col2, 'some constraint defined
as an UDF parameter - text or list<text>, etc.')
For the constraint, the UDF would need to be extended to support literals
(CASSANDRA-10783).
Is that in line with what you were thinking?
> Filter by UDF
> -------------
>
> Key: CASSANDRA-8488
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8488
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL, Local Write-Read Paths
> Reporter: Jonathan Ellis
> Labels: client-impacting, cql, udf
> Fix For: 3.x
>
>
> Allow user-defined functions in WHERE clause with ALLOW FILTERING.
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