hpcc-systems/HPCC-Platform — pull request #1905 by ghalliday (2012-03-19 15:43:18+00:00)
Title: Always fold expressions trees after optimizing

Often folding no_select(no_createrow, som-field) will generate lots of
opportunities for constant folding. This ensures trees that are
transformed are also folded.

Signed-off-by: Gavin Halliday