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* Moving all unnest cursor code atop refactored code for unnest * Updating unnest cursor * Removing dedup and fixing up some null checks * AllowList changes * Fixing some NPEs * Using bitset for allowlist * Updating the initialization only when cursor is in non-done state * Updating code to skip rows not in allow list * Adding a flag for cases when first element is not in allowed list * Updating for a null in allowList * Splitting unnest cursor into 2 subclasses * Intercepting some apis with columnName for new unnested column * Adding test cases and renaming some stuff * checkstyle fixes * Moving to an interface for Unnest * handling null rows in a dimension * Updating cursors after comments part-1 * Addressing comments and adding some more tests * Reverting a change to ScanQueryRunner and improving a comment * removing an unused function * Updating cursors after comments part 2 * One last fix for review comments * Making some functions private, deleting some comments, adding a test for unnest of unnest with allowList * Adding an exception for a case * Closure for unnest data source * Adding some javadocs * One minor change in makeDimSelector of columnarCursor * Updating an error message * Update processing/src/main/java/org/apache/druid/segment/DimensionUnnestCursor.java Co-authored-by: Abhishek Agarwal <1477457+abhishekagarwal87@users.noreply.github.com> * Unnesting on virtual columns was missing an object array, adding that to support virtual columns unnesting * Updating exceptions to use UOE * Renamed files, added column capability test on adapter, return statement and made unnest datasource not cacheable for the time being * Handling for null values in dim selector * Fixing a NPE for null row * Updating capabilities * Updating capabilities Co-authored-by: Abhishek Agarwal <1477457+abhishekagarwal87@users.noreply.github.com>