fix schema nullability for information_schema schema
#2804
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Which issue does this PR close?
Part of #2778
Rationale for this change
apache/arrow-rs#1888 (added in
arrow 17.0.0) added validation toRecordBatchif the schema's declared nullability is different than its actual nullability it throws a runtime error.What changes are included in this PR?
Correct declared schema nullability in
information_schemacalculationsThere are no tests in this PR -- they are covered in #2778
Are there any user-facing changes?
kind of -- the schema of
information_schemais slightly different (some columns are now marked as nullable)