[SPARK-8117] [SQL] Push codegen implementation into each Expression#6690

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rxin wants to merge 19 commits intoapache:masterfrom

Commits on Jun 4, 2015

pushing codegen into Expression
Davies Liu
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refactor
Davies Liu
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Commits on Jun 5, 2015

add type alias
Davies Liu
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fix style
Davies Liu
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update docs
Davies Liu
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rename
Davies Liu
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fix build
Davies Liu
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fix test
Davies Liu
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Some code gen update.
rxin
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Merge pull request #5 from rxin/codegen
Davies Liu
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address comments
Davies Liu
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fix style
Davies Liu
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consts fold
Davies Liu
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address comments
Davies Liu
committed

Commits on Jun 6, 2015

improve coverage and tests
Davies Liu
committed
address comments
Davies Liu
committed

Commits on Jun 7, 2015