[GitHub] [madlib] njayaram2 opened a new pull request #408: DL: Fix predict with 'NULL' string class values

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njayaram2 opened a new pull request #408: DL: Fix predict with 'NULL' string class values
URL: https://github.com/apache/madlib/pull/408
 
 
   JIRA: MADLIB-1357
   Fix handling of 'NULL' string for class values in predict. 'NULL' string
   as a class value was getting reported the same way as a Postgres NULL
   class value (i.e., empty). This commit double-quotes a 'NULL' string
   class value in the relevant query.
   NOTE: In predict, if we use 'prob' as the pred_type, we create a column
   for each distinct class level. The column name for Postgres NULL class
   level is 'prob_NULL', and the column name for a 'NULL' string class
   value will be 'prob_"NULL'.

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