feat: add null value filter#1721

Draft

sadakchap wants to merge 7 commits intoparse-community:alphafrom

sadakchap:add-isnull-filter

Commits on Jun 2, 2021

add isNull filter for all datatypes
sadakchap
committed

Commits on Jun 3, 2021

filtering null values only
sadakchap
committed

Commits on Jun 4, 2021

changed filter name & query
sadakchap
committed

Commits on Sep 23, 2021

Merge branch 'master' into add-isnull-filter
mtrezza
authored

Commits on Sep 24, 2021

Merge branch 'master' into add-isnull-filter
mtrezza
authored

Commits on Oct 19, 2021

Merge branch 'alpha' into add-isnull-filter
mtrezza
authored

Commits on Jan 3, 2022

Merge branch 'alpha' into add-isnull-filter
mtrezza
authored