Correct obsolete UNION hash aggs comment.
Oversight in commit which added disk-based hash aggregation.
Backpatch: 13-, where disk-based hash aggregation was introduced.
@@ -944,11 +944,10 @@ make_union_unique(SetOperationStmt *op, Path *path, List *tlist,
/*
* XXX for the moment, take the number of distinct groups as equal to the
- * total input size, ie, the worst case. This is too conservative, but we
- * don't want to risk having the hashtable overrun memory; also, it's not
- * clear how to get a decent estimate of the true size. One should note
- * as well the propensity of novices to write UNION rather than UNION ALL
- * even when they don't expect any duplicates...
+ * total input size, ie, the worst case. This is too conservative, but
+ * it's not clear how to get a decent estimate of the true size. One
+ * should note as well the propensity of novices to write UNION rather
+ * than UNION ALL even when they don't expect any duplicates...
*/
dNumGroups = path->rows;
