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This is preparatory refactoring to prepare the way for partition-wise aggregate, which will reuse the new subroutines for child grouping rels. It also does not seem like a bad idea on general principle, as the function was getting pretty long. Jeevan Chalke. The larger patch series of which this patch is a part was reviewed and tested by Antonin Houska, Rajkumar Raghuwanshi, Ashutosh Bapat, David Rowley, Dilip Kumar, Konstantin Knizhnik, Pascal Legrand, and me. Some cosmetic changes by me. Discussion: http://postgr.es/m/CAM2+6=V64_xhstVHie0Rz=KPEQnLJMZt_e314P0jaT_oJ9MR8A@mail.gmail.com
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