ARROW-10322: [C++][Dataset] Minimize Expression#8894

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bkietz wants to merge 38 commits intoapache:masterfrom

bkietz:10322-Minimize-Expression-to-a-

Commits on Jan 6, 2021

ARROW-10322: [C++][Dataset] Minimize dataset::Expression
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replace filtering with Expression2
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remove ExpressionState
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repair implicit casts
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delete Expression DSL operators and old Expression class
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rename Expression2 -> Expression
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first pass at repairing bindings
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add more scalar cast implementations
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use dataset___expr__call to create Call expressions
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lint fixes
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Refactor dataset expression code to follow array expression pattern

nealrichardson
authored and
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A little more

nealrichardson
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revamp Expression::ToString, make cast-from-string error more informative
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print and_kleene, or_kleene as binary ops
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clean up Expression class, extract Parameter
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revert variant noexcept changes
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get python binding building
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fix doc generation for struct function
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review comments
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repair linkage on Expression friends
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centos-7 doesn't recognize this initializer list
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get test_{dataset,parquet}.py passing
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move Identical() impl to .cc
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export ExecuteScalarExpression
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remove test_parquet.py
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rename struct->project, move out of cast's test
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add some docstrings
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extract BindNonRecursive, filter2->filter, comments
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move more things to namespace{}, docstring for Modify
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ensure field_ref into list safely errors
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debug prints
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remove unused functions
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take ownership of buffer to preserve deserialized arrays' storage
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cleanup, FieldPath::operator bool -> empty
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move project to scalar_nested.cc, add test for different chunking
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remove AddSimpleArrayOnlyCast
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clang-format
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incorrect projection in CsvFileFormat
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