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vtexplain support select distinct and other expressions #5139

Merged
merged 3 commits into from
Aug 30, 2019
Merged

vtexplain support select distinct and other expressions #5139

merged 3 commits into from
Aug 30, 2019

Commits on Aug 27, 2019

  1. support more expression types in vtexplain 

    Rework the vtexplain simulated mysql to handle more expression types
when calculating fake column results based on inferences off the select
expression.

Also change the engine so that it logs an error instead of failing
outright, since the column values aren't always needed for it to
effectively simulate a query.

Signed-off-by: Michael Demmer <mdemmer@slack-corp.com>
    @demmer
    demmer committed Aug 27, 2019
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  2. add vtexplain support for union statements 

    Signed-off-by: Michael Demmer <mdemmer@slack-corp.com>
    @demmer
    demmer committed Aug 27, 2019
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  3. make union all work for three or more statements 

    Signed-off-by: Michael Demmer <mdemmer@slack-corp.com>
    @demmer
    demmer committed Aug 27, 2019
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