Resolution: Won't Fix
Affects Version/s: None
Fix Version/s: None
There is potential inconsistency between the return value of Filter#hasFilterRow() and presence of Filter#filterRow().
Filters may override Filter#filterRow() while leaving return value of Filter#hasFilterRow() being false (inherited from FilterBase).
Downside to purely depending on hasFilterRow() telling us whether custom filter overrides filterRow(List) or filterRow() is that the check below may be rendered ineffective:
When user forgets to override hasFilterRow(), the above check becomes not useful.
Another limitation is that we cannot optimize FilterList#filterRow() through short circuit when FilterList#hasFilterRow() turns false.
This JIRA aims to remove the inconsistency by automatically detecting the presence of overridden Filter#filterRow(). For FilterBase-derived classes, if filterRow() is implemented and not inherited from FilterBase, it is equivalent to having hasFilterRow() return true.
With precise detection of presence of Filter#filterRow(), the following code from HRegion is no longer needed while backward compatibility is kept.