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https://issues.apache.org/jira/browse/MADLIB-1213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Frank McQuillan updated MADLIB-1213:
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Fix Version/s: (was: v1.15)
> Support expressions for minibatch preprocessor
> ----------------------------------------------
>
> Key: MADLIB-1213
> URL: https://issues.apache.org/jira/browse/MADLIB-1213
> Project: Apache MADlib
> Issue Type: Improvement
> Components: Module: Utilities
> Reporter: Jingyi Mei
> Priority: Major
>
> The minibatch preprocessor currently does not support all expressions for
> independent, dependent and grouping columns.
> # Independent varname does not support any logical expression.
> # Dependent varname only supports logical expression for numerical columns.
> For ex 'length >1' is a valid expression but it does not support creating an
> alias for this expression.
> # we might already support expressions that evaluate to array but haven't
> tested it.
> # Grouping col does not support any expressions
>
> This is the only expression that is supported for dependent variable
> {code}
> SELECT madlib.minibatch_preprocessor('minibatch_preprocessing_input',
> 'minibatch_preprocessing_out', 'y > 10', ' x1,x2', 4);
> {code}
> Not supported :
> {code}
> SELECT madlib.minibatch_preprocessor('minibatch_preprocessing_input',
> 'minibatch_preprocessing_out', 'y > 10 as foo', 'x1,x2', 4);
> {code}
> {code}
> SELECT madlib.minibatch_preprocessor('minibatch_preprocessing_input',
> 'minibatch_preprocessing_out', 'y=''F''', 'x1,x2', 4);
> {code}
> Open Questions :
> 1. How about expressions that evaluate to array ? We might already support
> this but haven't tested it yet.
> 2. Do we need to support logical expressions for all three ?
> 3. If yes, to what extent ?
> 4. Should the user be allowed to create an alias for logical expressions?
> 5. There might be other modules that may partially support logical
> expressions. Should we find out which modules ?
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