Improve "check_eol_junk" to detect junk although there are multi line comments in the way.

I.e take advantage of the fact that a # comment is always terminated by a new line 
Add tests for the above

client/mysqltest.c

@@ -3578,17 +3578,15 @@ void scan_command_for_warnings(struct st_command *command)
 
 /*
   Check for unexpected "junk" after the end of query
-  This is normally caused by missing delimiters
+  This is normally caused by missing delimiters or when
+  switching between different delimiters
 */
 
-void check_eol_junk(const char *eol)
+void check_eol_junk_line(const char *line)
 {
-  const char *p= eol;
-  DBUG_ENTER("check_eol_junk");
-  DBUG_PRINT("enter", ("eol: %s", eol));
-  /* Remove all spacing chars except new line */
-  while (*p && my_isspace(charset_info, *p) && (*p != '\n'))
-    p++;
+  const char *p= line;
+  DBUG_ENTER("check_eol_junk_line");
+  DBUG_PRINT("enter", ("line: %s", line));
 
   /* Check for extra delimiter */
   if (*p && !strncmp(p, delimiter, delimiter_length))
@@ -3604,6 +3602,36 @@ void check_eol_junk(const char *eol)
   DBUG_VOID_RETURN;
 }
 
+void check_eol_junk(const char *eol)
+{
+  const char *p= eol;
+  DBUG_ENTER("check_eol_junk");
+  DBUG_PRINT("enter", ("eol: %s", eol));
+
+  /* Skip past all spacing chars and comments */
+  while (*p && (my_isspace(charset_info, *p) || *p == '#' || *p == '\n'))
+  {
+    /* Skip past comments started with # and ended with newline */
+    if (*p && *p == '#')
+    {
+      p++;
+      while (*p && *p != '\n')
+        p++;
+    }
+
+    /* Check this line */
+    if (*p && *p == '\n')
+      check_eol_junk_line(p);
+
+    if (*p)
+      p++;
+  }
+
+  check_eol_junk_line(p);
+
+  DBUG_VOID_RETURN;
+}
+
 
 
 /*

mysql-test/r/mysqltest.result

@@ -152,6 +152,23 @@ mysqltest: At line 1: Missing delimiter
 mysqltest: At line 1: End of line junk detected: "sleep 7
 # Another comment
 "
+mysqltest: At line 1: Missing delimiter
+mysqltest: At line 1: Missing delimiter
+mysqltest: At line 1: End of line junk detected: "disconnect default
+
+#
+# comment
+# comment2
+
+# comment 3
+--disable_query_log
+"
+mysqltest: At line 1: End of line junk detected: "disconnect default # comment
+# comment part2
+
+# comment 3
+--disable_query_log
+"
 mysqltest: At line 1: Extra delimiter ";" found
 mysqltest: At line 1: Extra delimiter ";" found
 mysqltest: At line 1: Missing argument(s) to 'error'

mysql-test/t/mysqltest.test

@@ -359,18 +359,80 @@ select 3 from t1 ;
 # Missing delimiter
 # The comment will be "sucked into" the sleep command since
 # delimiter is missing until after "show status"
---system echo "sleep 4" > $MYSQLTEST_VARDIR/tmp/mysqltest.sql
---system echo "# A comment" >> $MYSQLTEST_VARDIR/tmp/mysqltest.sql
---system echo "show status;" >> $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+--write_file $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+sleep 4
+# A comment
+show status;
+EOF
 --error 1
 --exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/mysqltest.sql 2>&1
 
 #
 # Missing delimiter until eof
 # The comment will be "sucked into" the sleep command since
-# delimiter is missing 
---system echo "sleep 7" > $MYSQLTEST_VARDIR/tmp/mysqltest.sql
---system echo "# Another comment" >> $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+# delimiter is missing
+--write_file $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+sleep 7
+# Another comment
+EOF
+--error 1
+--exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/mysqltest.sql 2>&1
+
+#
+# Missing delimiter until "disable_query_log"
+#
+--write_file $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+disconnect default
+
+#
+# comment
+# comment 3
+disable_query_log;
+EOF
+--error 1
+--exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/mysqltest.sql 2>&1
+
+#
+# Missing delimiter until "disable_query_log"
+#
+--write_file $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+disconnect default
+
+#
+# comment
+
+# comment 3
+disable_query_log;
+EOF
+--error 1
+--exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/mysqltest.sql 2>&1
+
+#
+# Missing delimiter until eof
+#
+--write_file $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+disconnect default
+
+#
+# comment
+# comment2
+
+# comment 3
+--disable_query_log
+EOF
+--error 1
+--exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/mysqltest.sql 2>&1
+
+#
+# Missing delimiter until eof
+#
+--write_file $MYSQLTEST_VARDIR/tmp/mysqltest.sql
+disconnect default # comment
+# comment part2
+
+# comment 3
+--disable_query_log
+EOF
 --error 1
 --exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/mysqltest.sql 2>&1