After downgrading from Connector/ODBC 5.1 to Connector/ODBC 3.51, unrecognized names for connection string parameters caused warning messages about unknown options. (Bug #13647492)

SQLFetch has to return error if indicator pointer is NULL for NULL value. (Bug #13542600)

In some cases, a TIMESTAMP field could be described as SQL_NO_NULLS. (Bug #13532987)

A failure on one statement causes another statement to fail. (Bug #13097201, Bug #62657)

Describing a view or table caused SQLPrepare to prefetch table data. For large tables this created an intolerable performance hit. (Bug #46411)

MySQL Connector/ODBC manually added a LIMIT clause to the end of certain SQL statements, causing errors for statements that contained code that should be positioned after the LIMIT clause. (Bug #49726)