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https://issues.apache.org/jira/browse/MADLIB-1060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578806#comment-16578806
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Himanshu Pandey commented on MADLIB-1060:
-----------------------------------------
In KNN, we are using 'point_column_name' and 'test_column_name' are to
calculate the distance using the distance function passed by the user.
Supported distance functions accept arguments in array format and so does these
columns.
{code}
SELECT test.{test_id} AS {test_id_temp},
train.{point_id} as train_id,
{fn_dist}(
train.{point_column_name},
test.{test_column_name})
AS dist
{label_out}
FROM {point_source} AS train,
{test_source} AS test
) {x_temp_table}
{code}
So does this mean these columns should be supporting the array expressions
only?
> 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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