Github user orhankislal commented on the issue:
https://github.com/apache/incubator-madlib/pull/157
Tested on GPDB 4.3.12. kmeans IC fails with the following error:
```
SELECT * FROM kmeanspp('kmeans_2d', 'position', 10);
psql:/tmp/madlib.tPVzko/kmeans/test/kmeans.sql_in.tmp:116: ERROR: cannot
change the value of "optimiz
er"
CONTEXT: SQL statement " SET optimizer=off "
PL/pgSQL function "kmeanspp_seeding" line 20 at execute statement
SQL statement "SELECT madlib.kmeans( $1 , $2 , madlib.kmeanspp_seeding(
$1 , $2 , $3 , $4 , NULL
, $5 ), $4 , $6 , $7 , $8 )"
PL/pgSQL function "kmeanspp" line 4 at assignment
SQL statement "SELECT madlib.kmeanspp( $1 , $2 , $3 ,
'madlib.squared_dist_norm2'::VARCHAR, 'madlib
.avg'::VARCHAR, 20::INTEGER, 0.001::DOUBLE PRECISION, 1.0::DOUBLE
PRECISION)"
PL/pgSQL function "kmeanspp" line 4 at assignment
```
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