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When an alias is set to a column leading spaces are removed from the alias. But when this is done on aliases set by user this can lead to confusion. Now Item::set_name() method issues the warning if leading spaces were removed from an alias set by user. New warning message is added. mysql-test/t/select.test: Added test case for bug#10977:No warning issued if a column name is truncated. mysql-test/r/select.result: Added test case for bug#10977:No warning issued if a column name is truncated. sql/sql_yacc.yy: Fixed bug#10977: No warning issued if a column name is truncated The is_autogenerated_name flag is set before set_name() method call. sql/item.cc: Fixed bug#10977: No warning issued if a column name is truncated Now Item::set_name() method issues the warning if leading spaces were removed from an alias set by user.
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