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From Milinda Pathirage <>
Subject Merging Project and Scan when there are RexCalls in projections
Date Wed, 18 Mar 2015 14:51:18 GMT
Hi Julian,

I am trying to understand why Project and Scan merging is avoided when
there are projections which are RexCalls. Is this a purely implementation
related rule (such as separation of concerns or keeping scan as simple as
possible) or is there any theoretical background for this.

I am asking this because I discovered that Project#getMapping returns null
when there are RexCalls in the projection which prevent ProjectableScanRule
from transforming the logical expression tree.

Thanks in advance,

Milinda Pathirage

PhD Student | Research Assistant
School of Informatics and Computing | Data to Insight Center
Indiana University

twitter: milindalakmal
skype: milinda.pathirage

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