PrestoDB translator - IFNULL is translated as NULLIF

Teiid translates NULLIF function to nullif. However, those functions have different functionality. Note, this is the case for COALESCE with two arguments as well as that function is rewritten to IFNULL.
See PrestoDB doc

SELECT IFNULL(intnum, intkey) FROM BQT1.SmallA

SELECT nullif(g_0.intnum, g_0.intkey) FROM smalla AS g_0