Fix copy to directory table always return 1.

Fix when there is no file in directory table for copy to, the
return number is always 1 which should be zero.

Authored-by: Zhang Wenchao zwcpostgres@gmail.com

Author: zhangwenchao-123

src/backend/commands/copyto.c

@@ -1878,7 +1878,10 @@ CopyToDispatchDirectoryTable(CopyToState cstate)
 
 	pfree(cdbCopy);
 
-	return 1;
+	if (processed)
+		return 1;
+	else
+		return 0;
 }
 
 /*

src/test/regress/input/directory_table.source

@@ -388,6 +388,8 @@ COPY BINARY dir_table2 TO '@abs_srcdir@/data/dir_table2';  -- fail
 COPY BINARY dir_table1 TO '@abs_srcdir@/data/dir_table1';   -- fail
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation1' TO '@abs_srcdir@/data/nation1';   -- OK
 COPY BINARY DIRECTORY TABLE dir_table1 'nation1' TO '@abs_srcdir@/data/nation1';   -- OK
+\COPY BINARY DIRECTORY TABLE dir_table1 'unknown' TO '@abs_srcdir@/data/unknown';   -- OK
+COPY BINARY DIRECTORY TABLE dir_table1 'unknown' TO '@abs_srcdir@/data/unknown';    -- OK
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation2' TO stdin; -- OK
 COPY BINARY DIRECTORY TABLE dir_table1 'nation2' TO stdin; -- OK
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation2' TO stdout; -- OK

src/test/regress/output/directory_table.source

@@ -1044,6 +1044,8 @@ COPY BINARY dir_table1 TO '@abs_srcdir@/data/dir_table1';   -- fail
 ERROR:  COPY to directory table must specify the relative_path name.
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation1' TO '@abs_srcdir@/data/nation1';   -- OK
 COPY BINARY DIRECTORY TABLE dir_table1 'nation1' TO '@abs_srcdir@/data/nation1';   -- OK
+\COPY BINARY DIRECTORY TABLE dir_table1 'unknown' TO '@abs_srcdir@/data/unknown';   -- OK
+COPY BINARY DIRECTORY TABLE dir_table1 'unknown' TO '@abs_srcdir@/data/unknown';    -- OK
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation2' TO stdin; -- OK
 0|ALGERIA|0| haggle. carefully final deposits detect slyly agai
 1|ARGENTINA|1|al foxes promise slyly according to the regular accounts. bold requests alon

src/test/regress/output/directory_table_optimizer.source

@@ -1044,6 +1044,8 @@ COPY BINARY dir_table1 TO '@abs_srcdir@/data/dir_table1';   -- fail
 ERROR:  COPY to directory table must specify the relative_path name.
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation1' TO '@abs_srcdir@/data/nation1';   -- OK
 COPY BINARY DIRECTORY TABLE dir_table1 'nation1' TO '@abs_srcdir@/data/nation1';   -- OK
+\COPY BINARY DIRECTORY TABLE dir_table1 'unknown' TO '@abs_srcdir@/data/unknown';   -- OK
+COPY BINARY DIRECTORY TABLE dir_table1 'unknown' TO '@abs_srcdir@/data/unknown';    -- OK
 \COPY BINARY DIRECTORY TABLE dir_table1 'nation2' TO stdin; -- OK
 0|ALGERIA|0| haggle. carefully final deposits detect slyly agai
 1|ARGENTINA|1|al foxes promise slyly according to the regular accounts. bold requests alon