Bug#33812: mysql client incorrectly parsing DELIMITER

Remove unnecessary and incorrect code that tried to pull delimiter commands out of the
middle of statements

client/mysql.cc:
  Bug#33812: remove incorrect code
mysql-test/r/mysql.result:
  Bug#33812: test case
mysql-test/t/mysql_delimiter.sql:
  Bug#33812: test case

client/mysql.cc

@@ -2101,37 +2101,6 @@ static bool add_line(String &buffer,char *line,char *in_string,
 	continue;
       }
     }
-    else if (!*ml_comment && !*in_string &&
-             (end_of_line - pos) >= 10 &&
-             !my_strnncoll(charset_info, (uchar*) pos, 10,
-                           (const uchar*) "delimiter ", 10))
-    {
-      // Flush previously accepted characters
-      if (out != line)
-      {
-        buffer.append(line, (uint32) (out - line));
-        out= line;
-      }
-
-      // Flush possible comments in the buffer
-      if (!buffer.is_empty())
-      {
-        if (com_go(&buffer, 0) > 0) // < 0 is not fatal
-          DBUG_RETURN(1);
-        buffer.length(0);
-      }
-
-      /*
-        Delimiter wants the get rest of the given line as argument to
-        allow one to change ';' to ';;' and back
-      */
-      buffer.append(pos);
-      if (com_delimiter(&buffer, pos) > 0)
-        DBUG_RETURN(1);
-
-      buffer.length(0);
-      break;
-    }
     else if (!*ml_comment && !*in_string && is_prefix(pos, delimiter))
     {
       // Found a statement. Continue parsing after the delimiter

mysql-test/r/mysql.result

@@ -38,6 +38,8 @@ t2
 t3
 Tables_in_test
 t1
+delimiter
+1
 _
 Test delimiter : from command line
 a

mysql-test/t/mysql_delimiter.sql

@@ -59,3 +59,9 @@ source t/mysql_delimiter_19799.sql
 use test//
 show tables//
 delimiter ; # Reset delimiter
+
+#
+# Bug #33812: mysql client incorrectly parsing DELIMITER
+#
+select a as delimiter from t1
+delimiter ; # Reset delimiter