odbc 1.4.0

Major changes

• New odbc::databricks() makes it easier to connect to Databricks,
  automatically handling many common authentication scenarios (@atheriel, #615).

• dbListTables(), dbListFields() and dbExistsTable() automatically
  escape underscores in identifier arguments. This leads to substantial
  performance improvements for some backends (e.g. snowflake)
  (@detule, @fh-afrachioni, #618).

• dbGetQuery() and dbSendQuery() now set immediate = TRUE if you are
  not using a parameterised query. That should yield a small speed boost in
  many cases (#633).

Minor improvements and bug fixes

• Increased the minimum required R version from 3.2.0 to 3.6.0
  (@simonpcouch, #629).

• S4 classes for the most database drivers are now exported, make it possible
  to use in other packages (#558).

• ODBC errors are now spread across multiple lines, making them easier to
  read (@detule, #564).

• DBI::dbConnect(odbc::odbc()) now gives a clear error if you supply multiple
  arguments with the same name when case is ignored (#641).

• DBI::dbConnect(odbc::odbc()) now automatically quotes argument values that need
  it (#616).

Driver specific changes

• Oracle: Fix regression when falling back to odbcConnectionColumns() to
  describe column data types (@detule, #587)

• Spark SQL: Correctly enumerate schemas away from the current catalog
  (@detule, #614)

• Snowflake: improved translation from R to snowflake types (@meztez, #599).

• SQL Server

  • Improved handling for local temp tables in dbWrite(), dbAppendTable(),
    and dbExistTable() (@detule, #600)

  • Specialize syntax in sqlCreateTable to avoid failures when
    writing to (new) local temp tables. (@detule, #601)

• Teradata: Improved handling for temp tables (@detule and @But2ene, #589, 590)