ARROW-10330: [Rust][DataFusion] Implement NULLIF() SQL function#8688

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velvia wants to merge 16 commits intoapache:masterfrom

urbanlogiq:evan/rust-datafusion-nullif-func

Commits on Nov 23, 2020

[Rust][kernels] Add nullif boolean kernel
Evan Chan
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Add nullif_func as expression function
Evan Chan
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Add nullif as supported built-in function. SQL test doesn't pass yet.
Evan Chan
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Compilation fixes for latest master
Evan Chan
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NULLIF: return type might be coerced; make return types consistent
Evan Chan
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Fix test
Evan Chan
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Cargo fmt
Evan Chan
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@jorgecarleitao's suggestion

authored and
Evan Chan
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Some CR feedback
Evan Chan
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Fix build issues, tests pass
Evan Chan
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Fix null_counts in arrays created from nullif() kernel
Evan Chan
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cargo fmt
Evan Chan
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Fix nullif kernel for arrays with nonzero offsets
Evan Chan
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Datafusion README: nullif support
Evan Chan
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Cargo fmt and import fixes for latest master
Evan Chan
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Commits on Nov 25, 2020

Clean up test and address right buffer bit slice
Evan Chan
committed