ARROW-5588: [C++] Better support for building union arrays - #4781

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bkietz wants to merge 16 commits into

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bkietz:5588-Better-support-for-building-UnionArrays

Commits on Jul 11, 2019

minor refactors, adding some asserts
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d20055a
first pass at updating DenseUnionBuilder
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7902d12
add test for lazily typed union builder
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351905d
add tests for building lists where the value builder has mutable type
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8d4f36d
add SparseUnionBuilder and MakeBuilder case
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6245c82
Adding support for DenseUnions to ArrayFromJSON
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33fade1
improve doccomments, dedupe test code
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5b1ec93
debugging: highlight the broken case and a similar one
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5742db9
revert changes to reader.cc
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cf1c5be
Disable ListOfDictionary test until ListBuilder is updated
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673916e
explicit uint8_t for msvc
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37de5f2
rewrite union builder to share a base class, let children_ be indexed by type_id
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fd64c1b
separate child builder array indexable by type_id
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4131fe3
construct offset_builder_ with a MemoryPool
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17e6e27
address review comments
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0efe91d

Commits on Jul 12, 2019

iwyu #include <limits>
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