tree 63984050781592d7afaf748b0ee6095cfa5bb590
parent 2e47b2f3d428140d94a8d9ddd4a89c885ad51a9c
author Heikki Linnakangas <heikki.linnakangas@iki.fi> 1549037798 +0200
committer Nikhil Kak <nkak@pivotal.io> 1549318940 -0800

Fix deparsing of a table's DISTRIBUTED BY clause for GPDB 6.

JIRA: MADLIB-1298

GPDB 6 makes changes to the gp_distribution_policy catalog table:
'attrnums' column is renamed to 'distkeys', and its datatype changes from
smallint[] to int2vector. It also adds a new column, distopclasses, which
needs to be taken into account when looking at a table's distribution key,
along with the attribute numbers. See GPDB commits 69ec6926c2 and
242783ae9f for details.

Fortunately, GPDB 6 also adds a helper function,
pg_catalog.pg_get_distributed_by(), to do the deparsing for us. Use that
function when running on GPDB 6.

Closes #349