mi_boolean  
mi_qual_const_depends_outer(MI_AM_QUAL_DESC *qualDesc)

qualDesc

points to the qualification descriptor.

If this mi_qual_const_depends_outer() evaluates to MI_TRUE, the join or subquery can produce a different constant value for each rescan.

Call mi_qual_const_depends_outer() in am_rescan. If your access method has no am_rescan purpose function, call mi_qual_const_depends_outer() in am_beginscan.

MI_TRUE indicates that the constant depends on an outer join. MI_FALSE indicates that the constant remains the same on a rescan.

See the description of accessor function mi_qual_constant().