the lexer API which internally uses  unsigned char variables to
address its state map. The implementation of the lexer should be
internal to the lexer, and not influence the rest of the code.


sql/event_data_objects.cc:
  Clean up unnecessary type casts.
sql/event_data_objects.h:
  Clean up unnecessary type casts.
sql/ha_ndbcluster.cc:
  Clean up unnecessary type casts.
sql/mysql_priv.h:
  Clean up unnecessary type casts.
sql/partition_info.h:
  Clean up unnecessary type casts.
sql/sp.cc:
  Clean up unnecessary type casts.
sql/sp_head.cc:
  Clean up unnecessary type casts.
sql/sp_head.h:
  Clean up unnecessary type casts.
sql/sql_lex.cc:
  Clean up unnecessary type casts.
sql/sql_lex.h:
  Clean up unnecessary type casts.
sql/sql_parse.cc:
  Clean up unnecessary type casts.
sql/sql_partition.cc:
  Clean up unnecessary type casts.
sql/sql_partition.h:
  Clean up unnecessary type casts.
sql/sql_prepare.cc:
  Clean up unnecessary type casts.
sql/sql_trigger.cc:
  Clean up unnecessary type casts.
sql/sql_view.cc:
  Clean up unnecessary type casts.
sql/sql_yacc.yy:
  Clean up unnecessary type casts.
sql/table.cc:
  Clean up unnecessary type casts.
sql/table.h:
  Clean up unnecessary type casts.