Update comment to clarify fetch limit and LIMIT.

diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index e371db24a110e7969fd6f115daef702c7d8cf075..3dfb736cbf7e43014c7f5cbee6f212135f7e572c 100644 (file)
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -157,7 +157,8 @@ ExecutorStart(QueryDesc *queryDesc, EState *estate)
  *             except to start up/shut down the destination.  Otherwise,
  *             we retrieve up to 'count' tuples in the specified direction.
  *
- *             Note: count = 0 is interpreted as "no limit".
+ *             Note: count = 0 is interpreted as no portal limit, e.g. run to
+ *             completion.
  *
  * ----------------------------------------------------------------
  */