Build bison warning

Hello,

On pc Debian x86-64 with master sources updated yesterday, I noticed this
during building:
/home/julien/compile-libreoffice/libreoffice/rsc/source/parser/rscyacc.y:
warning: 2 shift/reduce conflicts [-Wconflicts-sr]
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:
warning: 2 nonterminals useless in grammar [-Wother]
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:
warning: 3 rules useless in grammar [-Wother]
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:222.65-84:
warning: nonterminal useless in grammar: row_value_const_list [-Wother]
 %type <pParseNode> table_value_const_list row_value_constructor
row_value_const_list row_value_constructor_elem
                                                                
^^^^^^^^^^^^^^^^^^^^
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:228.20-33:
warning: nonterminal useless in grammar: extract_source [-Wother]
 %type <pParseNode> extract_source char_length_exp octet_length_exp
bit_length_exp select_sublist string_value_exp
                    ^^^^^^^^^^^^^^
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:751.25-753.40:
warning: rule useless in grammar [-Wother]
                        row_value_constructor_elem
                         ^^^^^
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:754.17-756.33:
warning: rule useless in grammar [-Wother]
        |       row_value_const_list ',' row_value_constructor_elem
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:1766.17-1770.17:
warning: rule useless in grammar [-Wother]
                datetime_value_exp
                 ^^^^
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:
warning: 13 shift/reduce conflicts [-Wconflicts-sr]
/home/julien/compile-libreoffice/libreoffice/connectivity/source/parse/sqlbison.y:
warning: 15 reduce/reduce conflicts [-Wconflicts-rr]

May these rules be removed or should they be used in a way?
What about reduce and shift conflicts, any bison expert here?

BTW, all these warnings are not new but I think it could help to harden the
code (and perhaps prevent some bugs or optimize a bit)

Julien 



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