Bug#31210 - INSERT DELAYED crashes server when used on

            partitioned table

Trying INSERT DELAYED on a partitioned table, that has not been
used right before, crashes the server. When a table is used for
select or update, it is kept open for some time. This period I
mean with "right before".

Information about partitioning of a table is stored in form of
a string in the .frm file. Parsing of this string requires a
correctly set up lexical analyzer (lex). The partitioning code
uses a new temporary instance of a lex. But it does still refer
to the previously active lex. The delayd insert thread does not
initialize its lex though...

Added initialization for thd->lex before open table in the delayed
thread and at all other places where it is necessary to call
lex_start() if all tables would be partitioned and need to parse
the .frm file.

1 files changed, 3 insertions, 0 deletions

diff --git a/sql/table.cc b/sql/table.cc
index ccddbf8134b..26008f0aa19 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -1608,6 +1608,9 @@ int open_table_from_share(THD *thd, TABLE_SHARE *share, const char *alias,
   DBUG_PRINT("enter",("name: '%s.%s'  form: 0x%lx", share->db.str,
                       share->table_name.str, (long) outparam));
 
+  /* Parsing of partitioning information from .frm needs thd->lex set up. */
+  DBUG_ASSERT(thd->lex->is_lex_started);
+
   error= 1;
   bzero((char*) outparam, sizeof(*outparam));
   outparam->in_use= thd;