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

@@ -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);