Fixed the CREATE TABLE IF EXIST generates warnings instead of errors

mysql-test/r/create.result:
  Updated test results
mysql-test/t/create.test:
  Updated test
sql/sql_base.cc:
  Use push_internal_handler/pop_internal_handler to avoid errors & warnings instead of clear_error
  Give a warnings instead of an error for CREATE TABLE IF EXISTS
sql/sql_parse.cc:
  Check if we failed because of table exists (can only happen from create)
sql/sql_table.cc:
  Check if we failed because of table exists (can only happen from create)

1 files changed, 8 insertions, 1 deletions

diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 5dac052b749..de35d2f3d27 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -2512,7 +2512,14 @@ case SQLCOM_PREPARE:
         goto end_with_restore_list;
       }
 
-      if (!(res= open_and_lock_tables(thd, lex->query_tables, TRUE, 0)))
+      res= open_and_lock_tables(thd, lex->query_tables, TRUE, 0);
+      if (res)
+      {
+        /* Got error or warning. Set res to 1 if error */
+        if (!(res= thd->is_error()))
+          my_ok(thd);                           // CREATE ... IF NOT EXISTS
+      }
+      else
       {
         /* The table already exists */
         if (create_table->table)