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Add exists subquery support.#144

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ngaut merged 15 commits intomasterpingcap/tidb:masterfrom qiuyesuifeng/exists-subquerypingcap/tidb:qiuyesuifeng/exists-subqueryCopy head branch name to clipboardSep 15, 2015

+224-19

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Commits on Sep 14, 2015

• *: add base exists subquery framework.

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  76475b2

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• expression/expressions: add exists subquery support.

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  22612fd

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• parser/parser_test: add a compile fail test.

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  f4e06f0

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• expression/expressions: fix exists subqueyr null value bug.

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  b7e641b

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• expression/expressions: add exists subquery test.

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• expression/expressions: tiny clean up test.

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• Merge branch 'master' into qiuyesuifeng/exists-subquery

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• parser, expression/expressions: fix parser conflict bug.

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Commits on Sep 15, 2015

• Merge branch 'master' into qiuyesuifeng/exists-subquery

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• expression/expressions: use plan.Next() insead of plan.Do().

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  d8246b7

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• expression/expressions: add not exists subquery test.

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  c29d726

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• expression/expressions: tiny clean up.

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  aae463b

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• expression/expressions: address comment.

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• Merge branch 'master' into qiuyesuifeng/exists-subquery

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• Merge branch 'master' into qiuyesuifeng/exists-subquery

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