Fix for "table dropped by concurrent query" on Redshift#825

Merged

drewbanin merged 3 commits intodevelopmentfrom fix/relation-build-flow

Jul 9, 2018

+259-8

Commits on Jul 4, 2018

(Fixes #653 ) Reliably reproduce concurrent query failure on redshift
drewbanin
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Update table and view materializations to be transaction citizens
drewbanin
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Commits on Jul 6, 2018

pr feedback: drop backup tables if they exist
drewbanin
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