[BEAM-2855] nexmark python suite implement queries 0, 1, 2 and 9#12427

Merged

pabloem merged 18 commits intoapache:masterfrom

leiyiz:nexmark

Aug 13, 2020

Commits on Jul 24, 2020

changed parser and serialization code to use the same json format to represent models, added auctionprice model and corrected the behavior of query2, corrected the behavior of query 0 and 1 to alig…
leiyiz
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Merge branch 'master' of https://github.com/apache/beam into nexmark
leiyiz
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changed repr and aligned code style.
leiyiz
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Commits on Jul 28, 2020

Commits on Jul 29, 2020

Commits on Aug 2, 2020

resolve issues brought up in code review
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Commits on Aug 3, 2020

resolve py2.7 lint error for import and python3 type hint
leiyiz
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Commits on Aug 4, 2020

fix 3.7 lint errors
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Commits on Aug 6, 2020

resolve issues brought up in code review
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Commits on Aug 7, 2020

better formatting for nexmark_util docs
leiyiz
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Commits on Aug 12, 2020

exported StreamCoderImpl to fix issue with pydoc
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