Only DISCARD ALL should be in the command_no_begin list.

ItGacky · ItGacky · commit 62b6aaa40b2a · 2010-09-28T15:55:25.000+09:00
We allowes DISCARD PLANS and TEMP in a transaction.
diff --git a/src/bin/psql/common.c b/src/bin/psql/common.c
@@ -1388,8 +1388,20 @@ command_no_begin(const char *query)
 			return true;
 	}
 
+	/* DISCARD ALL isn't allowed in xacts, but other variants are allowed. */
 	if (wordlen == 7 && pg_strncasecmp(query, "discard", 7) == 0)
-		return true;
+	{
+		query += wordlen;
+
+		query = skip_white_space(query);
+
+		wordlen = 0;
+		while (isalpha((unsigned char) query[wordlen]))
+			wordlen += PQmblen(&query[wordlen], pset.encoding);
+
+		if (wordlen == 3 && pg_strncasecmp(query, "all", 3) == 0)
+			return true;
+	}
 
 	return false;
 }
