• Fixed warnings about anonymous unions (@detule, #440)
• Fixed invalid descriptor issues when retrieving results from SQL Server +
  Microsoft's ODBC driver, using parametrized queries. (@detule, #414)
• Fixed null handling in SQL Server / Azure result sets retrieved with
  Microsoft's ODBC driver. (@detule, #408)
• Hive uses C-style escaping for string literals (single quotes are
  backslash-escaped, note single quote-escaped). dbQuoteString now respects
  this when called on a connection of class Hive. (@rnorberg, #184)
• When calling sqlCreateTable(con, ..., temporary = TRUE) and con is a
  connection of class DB2/AIX64, the CREATE TABLE statement that is generated
  properly creates a temporary table in DB2. The statement begins with
  DECLARE GLOBAL TEMPORARY TABLE
  and ends with ON COMMIT PRESERVE ROWS (DB2's default behavior is
  ON COMMIT DELETE ROWS, which results in the inserted data being
  deleted as soon as dbWriteTable completes). (@rnorberg, #426)