Commits on Jun 12, 2024

1. MDEV-33971 NAME_CONST in WHERE clause replaced by inner item …

   Improve performance of queries like
     SELECT * FROM t1 WHERE field = NAME_CONST('a', 4);
   by, in this example, replacing the WHERE clause with field = 4
   in the case of ref access.
   
   The rewrite is done during fix_fields and we disambiguate this
   case from other cases of NAME_CONST by inspecting where we are
   in parsing.  We rely on THD::where to accomplish this.  To
   improve performance there, we change the type of THD::where to
   be an enumeration, so we can avoid string comparisons during
   Item_name_const::fix_fields.  Consequently, this patch also
   changes all usages of THD::where to conform likewise.

   

   DaveGosselin-MariaDB committed Jun 12, 2024
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