Athenacli

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Features
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* Add support for `arn_role` in athenaclirc file to allow connection to assume aws role. (Thanks: pdpark)

Internal:
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* deprecate python versions 2.7, 3.4, 3.5 (Thanks: zzl0)

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Features
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* Show query execution statistics, such as the amount of data scanned and the approximate cost. (Thanks: pgr0ss)

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Features
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* Add a download command to fetch query results to a local CSV. (Thanks: pgr0ss)

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Features
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* Add auto-complete support for `JOIN` and related keywords. (Thanks: getaaron)

Bugfix
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* Fix bug when completing `ON parent.` clauses. (Thanks: pgr0ss)

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Internal
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* Require prompt_toolkit>=2.0.6. (Thanks: zzl0)

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Bugfix
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* `distinct` keyword cause an unexpected exception. (Thanks: zzl0)