From 2ccc2ff5506cdb32e451c59c1adc65d9edda47b4 Mon Sep 17 00:00:00 2001
From: Neil Conway <neilc@samurai.com>
Date: Fri, 22 Jun 2007 03:19:57 +0000
Subject: [PATCH] In psql, when running a SELECT query using a cursor, flush
 the query output after each FETCH. This ensures that incremental results are
 available to clients that are executing long-running SELECT queries via the
 FETCH_COUNT feature.

---
 src/bin/psql/common.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/bin/psql/common.c b/src/bin/psql/common.c
index ebd6aee017..25273ccc99 100644
--- a/src/bin/psql/common.c
+++ b/src/bin/psql/common.c
@@ -1076,6 +1076,12 @@ ExecQueryUsingCursor(const char *query, double *elapsed_msec)
 
 		printQuery(results, &my_popt, pset.queryFout, pset.logfile);
 
+		/*
+		 * Make sure to flush the output stream, so intermediate
+		 * results are visible to the client immediately.
+		 */
+		fflush(pset.queryFout);
+
 		/* after the first result set, disallow header decoration */
 		my_popt.topt.start_table = false;
 		my_popt.topt.prior_records += ntuples;
-- 
2.39.5