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https://issues.apache.org/jira/browse/MADLIB-1060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16581752#comment-16581752
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Frank McQuillan commented on MADLIB-1060:
-----------------------------------------
I think so. The expressions must return a valid type for the parameters, which
is
{code}
point_source
TEXT. Name of the table containing the training data points. Training data
points are expected to be stored row-wise in a column of type DOUBLE
PRECISION[].
point_column_name
TEXT. Name of the column with training data points.
{code}
and
{code}
test_source
TEXT. Name of the table containing the test data points. Testing data points
are expected to be stored row-wise in a column of type DOUBLE PRECISION[].
test_column_name
TEXT. Name of the column with testing data points.
{code}
> Support expressions for column names in k-NN
> --------------------------------------------
>
> Key: MADLIB-1060
> URL: https://issues.apache.org/jira/browse/MADLIB-1060
> Project: Apache MADlib
> Issue Type: Improvement
> Components: k-NN
> Reporter: Frank McQuillan
> Assignee: Himanshu Pandey
> Priority: Minor
> Labels: starter
> Fix For: v2.0
>
>
> Follow on to
> https://issues.apache.org/jira/browse/MADLIB-927
> {code}
> knn( point_source,
> point_column_name,
> label_column_name,
> test_source,
> test_column_name,
> id_column_name,
> output_table,
> operation,
> k
> )
> {code}
> Possible improvements:
> 1) The parameters 'point_column_name' and 'test_column_name' should support
> regular PostgreSQL expressions.
> 2) Should we infer 'c' or 'r' from the data types, rather than have to say
> explicitly?
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