Using the DATE() function in a WHERE clause did not return any records after encountering NULL. However, using TRIM or CAST produced the correct results. (Bug#29898)

For a table with a DATE column date_col such that selecting rows with WHERE date_col = 'date_val 00:00:00' yielded a non-empty result, adding GROUP BY date_col caused the result to be empty. (Bug#29729)

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Optimization of queries with DETERMINISTIC stored functions in the WHERE clause was ineffective: A sequential scan was always used. (Bug#29338)

Creation of a legal stored procedure could fail if no default database had been selected. (Bug#29050)

If a stored procedure was created and invoked prior to selecting a default database with USE, a No database selected error occurred. (Bug#28551)