Port DH-11933: Constant Formulas Should use SingleValueColumnSources #3326
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I used a little creative freedom to keep code style more consistent with DHC. There were some incorrect generic parameters in DHE that are fixed here. In DHC, SelectColumns are aggressively initialized before they reach the analyzer. Some comments were updated/removed to reflect this. I also inlined the helper method added to SelectColumn as it only applies to a very specific subset of DhFormulaColumn and only needs to be invoked by the FormulaAnalyzer.
The internal JIRA Ticket: DH-11933
The internal commit.
Nightlies are running here.