in reply to Pushing a 'hash slice' to an AoH

Your last example is equivalent to 
@{$events[$ctr++]}{'col1','col2','col3'} = @{$sqldata->[$i]}{'col1','c
+ol2','col3'};

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if you're inclined to do things slicewise.
We're not really tightening our belts, it just feels that way because we're getting fatter.

In Section Seekers of Perl Wisdom