isidentical opened a new pull request, #3246:
URL: https://github.com/apache/arrow-datafusion/pull/3246
# Which issue does this PR close?
Closes #3195.
# Rationale for this change
This PR implements `IS UNKNOWN` and `IS NOT UNKNOWN` SQL operations (similar
to #3235).
# What changes are included in this PR?
The transformation of SQL-level `IS UNKNOWN` / `IS NOT UNKNOWN` operations
to `IS DISTINCT FROM` queries in the logical level.
# Are there any user-facing changes?
2 new operators.
@andygrove [I assume that just like
#3225](https://github.com/apache/arrow-datafusion/pull/3189#discussion_r951814941),
this would also require some type-checking. Should we implement it afterwards,
or should we wait your PR and I can make the required changes in this PR.
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