MDEV-6112 multiple triggers per table

This is similar to MysQL Worklog 3253, but with
a different implementation. The disk format and
SQL syntax is identical with MySQL 5.7.

Fetures supported:
- "Any" ammount of any trigger
- Supports FOLLOWS and PRECEDES to be
  able to put triggers in a certain execution order.

Implementation details:
- Class Trigger added to hold information about a trigger.
  Before this trigger information was stored in a set of lists in
  Table_triggers_list and in Table_triggers_list::bodies
- Each Trigger has a next field that poinst to the next Trigger with the
  same action and time.
- When accessing a trigger, we now always access all linked triggers
- The list are now only used to load and save trigger files.
- MySQL trigger test case (trigger_wl3253) added and we execute these
  identically.
- Even more gracefully handling of wrong trigger files than before. This
  is useful if a trigger file uses functions or syntax not provided by
  the server.
- Each trigger now has a "Created" field that shows when the trigger was
  created, with 2 decimals.

Other comments:
- Many of the changes in test files was done because of the new "Created"
  field in the trigger file. This shows up in SHOW ... TRIGGER and when
  using information_schema.trigger.
- Don't check if all memory is released if on uses --gdb;  This is needed
  to be able to get a list from safemalloc of not freed memory while
  debugging.
- Added option to trim_whitespace() to know how many prefix characters
  was skipped.
- Changed a few ulonglong sql_mode to sql_mode_t, to find some wrong usage
  of sql_mode.

1 files changed, 4 insertions, 3 deletions

diff --git a/sql/sp_head.cc b/sql/sp_head.cc
index 41006f07a0a..37479c14047 100644
--- a/sql/sp_head.cc
+++ b/sql/sp_head.cc
@@ -707,6 +707,7 @@ sp_head::set_stmt_end(THD *thd)
 {
   Lex_input_stream *lip= & thd->m_parser_state->m_lip; /* shortcut */
   const char *end_ptr= lip->get_cpp_ptr(); /* shortcut */
+  uint not_used;
 
   /* Make the string of parameters. */
 
@@ -724,7 +725,7 @@ sp_head::set_stmt_end(THD *thd)
 
   m_body.length= end_ptr - m_body_begin;
   m_body.str= thd->strmake(m_body_begin, m_body.length);
-  trim_whitespace(thd->charset(), & m_body);
+  trim_whitespace(thd->charset(), &m_body, &not_used);
 
   /* Make the string of UTF-body. */
 
@@ -732,7 +733,7 @@ sp_head::set_stmt_end(THD *thd)
 
   m_body_utf8.length= lip->get_body_utf8_length();
   m_body_utf8.str= thd->strmake(lip->get_body_utf8_str(), m_body_utf8.length);
-  trim_whitespace(thd->charset(), & m_body_utf8);
+  trim_whitespace(thd->charset(), &m_body_utf8, &not_used);
 
   /*
     Make the string of whole stored-program-definition query (in the
@@ -741,7 +742,7 @@ sp_head::set_stmt_end(THD *thd)
 
   m_defstr.length= end_ptr - lip->get_cpp_buf();
   m_defstr.str= thd->strmake(lip->get_cpp_buf(), m_defstr.length);
-  trim_whitespace(thd->charset(), & m_defstr);
+  trim_whitespace(thd->charset(), &m_defstr, &not_used);
 }