Translate 'case when X is null...' to 'coalesce(X,...)'#93

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bgurmendi wants to merge 1 commit intonpgsql:devfrom

bgurmendi:fix_Error_sql_42P18_issue_62_and_60

Commits on May 3, 2018

Translate 'case when X is null...' to 'coalesce(X,...)'
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