do not leave sql command uninitialized, because it used for detection need of...

do not leave sql command uninitialized, because it used for detection need of preparation correct idends printing  during finding identifiers i


sql/sql_lex.h:
  do not leave sql command uninitialized, because it used for detection need of preparation correct idends printing  during finding identifiers in table list (alias resolving tracking)

sql/sql_lex.h

@@ -762,7 +762,7 @@ typedef struct st_lex
   */
   SQL_LIST trg_table_fields;
 
-  st_lex() :result(0)
+  st_lex() :result(0), sql_command(SQLCOM_END)
   {
     extern byte *sp_lex_spfuns_key(const byte *ptr, uint *plen, my_bool first);
     hash_init(&spfuns, system_charset_info, 0, 0, 0, sp_lex_spfuns_key, 0, 0);