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unknown authored
- Changed name resolution for GROUP BY so that derived columns do not shadow table columns from the FROM clause. As a result GROUP BY now is handled as a true ANSI extentsion. - Issue a warning when HAVING is resolved into ambiguous columns, and prefer the columns from the GROUP BY clause over SELECT columns. mysql-test/r/having.result: Correct result for updated GROUP BY name resolution. sql/item.cc: - prefer GROUP columns, but if none is found use SELECT list - issue a waring when a field may be resolved ambiguously - more/fixed comments sql/mysql_priv.h: More flexible find_field_in_tables(). sql/sp.cc: More flexible find_field_in_tables(). sql/sql_base.cc: More flexible find_field_in_tables(). sql/sql_help.cc: More flexible find_field_in_tables(). sql/sql_select.cc: - name resolution of GROUP/ORDER BY column references is differentiated: - GROUP BY is resolved in SELECT and FROM clauses - ORDER BY is resolved only in SELECT (as before) - more informative variable names - more comments
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