returns nothing
      
When looking for table or database names inside INFORMATION_SCHEMA
we must convert the table and database names to lowercase (just as it's
done in the rest of the server) when lowercase_table_names is non-zero.
This will allow us to find the same tables that we would find if there
is no condition.

Fixed by converting to lower case when extracting the database and 
table name conditions.
Test case added.

The columns in HAVING can reference the GROUP BY and 
SELECT columns. There can be "table" prefixes when
referencing these columns. And these "table" prefixes
in HAVING use the table alias if available.
This means that table aliases are subject to the same
storage rules as table names and are dependent on 
lower_case_table_names in the same way as the table 
names are.
Fixed by :
1. Treating table aliases as table names
and make them lowercase when printing out the SQL
statement for view persistence.
2. Using case insensitive comparison for table 
aliases when requested by lower_case_table_names


mysql-test/r/lowercase_view.result:
  Bug #31562: test case
mysql-test/t/lowercase_view.test:
  Bug #31562: test case
sql/item.cc:
  Bug #31562: lower_case_table_name contious comparison
  when searching in GROUP BY
sql/sql_base.cc:
  Bug #31562: lower_case_table_name contious comparison
  when searching in SELECT
sql/sql_select.cc:
  Bug #31562: treat table aliases as table names
  and make them lowercase when printing

mysql-test/t/lowercase_view.test:
  error code changed after merege
mysql-test/t/view.test:
  error code changed after merege
sql/item.cc:
  inline function used instead of frequently used expression
  removed old TODO
sql/sql_base.cc:
  layoutfixed
  inline function used instead of frequently used expression
sql/sql_insert.cc:
  inline function used instead of frequently used expression

frequently used command sequence replaced with inline function


BitKeeper/etc/config:
  logging switching off
mysql-test/r/lowercase_view.result:
  hided view underlying tables from error message
mysql-test/r/view.result:
  hided view underlying tables from error message
mysql-test/t/lowercase_view.test:
  hided view underlying tables from error message
mysql-test/t/view.test:
  hided view underlying tables from error message
sql/mysql_priv.h:
  subroutine which return correct error message
sql/share/errmsg.txt:
  new error message
sql/sql_base.cc:
  subroutine which issue correct error message in case of view presence for duplicated table on update
sql/sql_delete.cc:
  issue correct error message in case of view presence for duplicated table on update
sql/sql_insert.cc:
  issue correct error message in case of view presence for duplicated table on update
sql/sql_parse.cc:
  issue correct error message in case of view presence for duplicated table on update
sql/sql_update.cc:
  issue correct error message in case of view presence for duplicated table on update
sql/sql_view.cc:
  frequently used command sequence replaced with inline function
sql/table.cc:
  frequently used command sequence replaced with inline function
sql/table.h:
  frequently used command sequence replaced with inline function

(BUG##9398, BUG#8703)
fixed wrong join view detection in multi-delete which lead to server crash


mysql-test/r/lowercase_view.result:
  added new tests of updation and selection from the same table
mysql-test/r/view.result:
  added new tests of updation and selection from the same table
  added test of multidelete command over join view which lead to server crash
  test suite from bugs #9398 and #8703
mysql-test/t/lowercase_view.test:
  added new tests of updation and selection from the same table
mysql-test/t/view.test:
  added new tests of updation and selection from the same table
  added test of multidelete command over join view which lead to server crash
  test suite from bugs #9398 and #8703
sql/sql_base.cc:
  changed procedure of finding tables
sql/sql_class.cc:
  added derived table procession detection
sql/sql_class.h:
  added derived table procession detection
sql/sql_delete.cc:
  fixed detection of selection from table which update for multidelete
sql/sql_derived.cc:
  added derived table procession detection
sql/sql_lex.cc:
  added detection os SELECTs processed inside derived tables
  removed old mechanism of multidelete/multiupdate table duplication detection (which can't work with views)
sql/sql_lex.h:
  added detection os SELECTs processed inside derived tables
  removed old mechanism of multidelete/multiupdate table duplication detection (which can't work with views)
sql/sql_parse.cc:
  removed wrong test of join view (for multidelete in can be not only first table)
sql/sql_prepare.cc:
  added detection os SELECTs processed inside derived tables (reset it for reusing in PS/SP)
sql/sql_select.cc:
  added detection os SELECTs processed inside derived tables
sql/sql_update.cc:
  fixed detection of selection from table which update for multiupdate

correct printing of aliases


mysql-test/r/lowercase_view.result:
  aliases in VIEWs
mysql-test/t/lowercase_view.test:
  aliases in VIEWs
sql/item.cc:
  tracking using aliases in indentifiers
sql/item.h:
  tracking using aliases in indentifiers
sql/sql_base.cc:
  tracking using aliases in indentifiers
sql/sql_lex.cc:
  tracking using aliases in indentifiers
sql/sql_lex.h:
  tracking using aliases in indentifiers
sql/table.h:
  tracking using aliases in indentifiers

mysql-test/r/lowercase_view.result:
  test of updating and fetching from the same table check
mysql-test/r/view.result:
  test of updating and fetching from the same table check
mysql-test/t/lowercase_view.test:
  test of updating and fetching from the same table check
mysql-test/t/view.test:
  test of updating and fetching from the same table check
sql/mysql_priv.h:
  unique table test
sql/sql_base.cc:
  unique table test which take into account views added
sql/sql_delete.cc:
  unique table test which take into account views added
sql/sql_insert.cc:
  unique table test which take into account views added
sql/sql_parse.cc:
  unique table test which take into account views added
sql/sql_update.cc:
  unique table test which take into account views added
sql/sql_view.cc:
  unique table test which take into account views added
sql/table.h:
  save next independent (do not belong to current view) table

sql/item.cc:
  fixed table and db name of fields incase of lower_case_table_names