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https://issues.apache.org/jira/browse/MADLIB-1161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16175375#comment-16175375
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Rahul Iyer commented on MADLIB-1161:
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This error is because the summary table in v1.12 contains the 'null_proxy'
entry, which is expected in the predict function. Older versions don't create
this entry. The fix is pretty simple: add a default value for 'null_proxy' (=
NULL) when not available in summary table.
> DT: Trees trained by MADlib < 1.12 fail when predicted on 1.12
> --------------------------------------------------------------
>
> Key: MADLIB-1161
> URL: https://issues.apache.org/jira/browse/MADLIB-1161
> Project: Apache MADlib
> Issue Type: Bug
> Components: Module: Decision Tree
> Reporter: Rahul Iyer
> Fix For: v2.0
>
>
> Report from Scott Gai
> After upgrade madlib package from 1.11 to 1.12, the tree decision modles
> which were trained prior to upgrade started to fail with errors like below
> {code}
> ERROR: KeyError: 'null_proxy' (plpython.c:4656) CONTEXT: Traceback (most
> recent call last): PL/Python function "tree_predict", line 19, in <module>
> return decision_tree.tree_predict(**globals()) PL/Python function
> "tree_predict", line 1759, in tree_predict PL/Python function "tree_predict"
> ********** Error ********** ERROR: KeyError: 'null_proxy' (plpython.c:4656)
> SQL state: XX000 Context: Traceback (most recent call last): PL/Python
> function "tree_predict", line 19, in <module> return
> decision_tree.tree_predict(**globals()) PL/Python function "tree_predict",
> line 1759, in tree_predict PL/Python function "tree_predict"
> {code}
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