docs - update correlation statistic support
</dlentry>
<dlentry>
<dt>correlation</dt>
- <dd>Greenplum Database does not calculate the correlation statistic. </dd>
+ <dd>Greenplum Database computes correlation statistics for heap tables. These
+ statistics are used by the Postgres Planner. Greenplum does not compute
+ correlation statistics for AO and AOCO tables; the value in this column for
+ these table types is undefined.</dd>
</dlentry>
<dlentry>
<dt>most_common_elems</dt>
