[CALCITE-4199] Add nullability annotations to the methods and fields, ensure consistency with checkerframework#1929

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vlsi wants to merge 10 commits intoapache:masterfrom vlsi:checkerframework

+13,046-7,385

Commits on Nov 1, 2020

[CALCITE-4214] Make org.apache.calcite.rel.type.RelDataType#getSqlTypeName non-nullable
vlsi
committed
[CALCITE-4199] Add CheckerFramework to GitHub Actions CI
vlsi
committed
[CALCITE-4199] Add package-level NonNull annotations to calcite packages
vlsi
committed

Commits on Nov 3, 2020