[Backport] Range support in window expressions (support them as groups) #15703
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…15365) * support groups windowing mode; which is a close relative of ranges (but not in the standard) * all windows with range expressions will be executed wit it groups * it will be 100% correct in case for both bounds its true that: isCurrentRow() || isUnBounded() * this covers OVER ( ORDER BY COL ) * for other cases it will have some chances of getting correct results... (cherry picked from commit 8a43db9)
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Backport of #15365 to 29.0.0.