question: private PageLeafImpl compact ( TableKelp table ) { long now = CurrentTime . currentTime ( ) / 1000 ; Set < PageLeafEntry > entries = fillEntries ( table ) ; ArrayList < BlockLeaf > blocks = new ArrayList < > ( ) ; BlockLeaf block = new BlockLeaf ( getId ( ) ) ; blocks . add ( block ) ; Row row = table . row ( ) ; for ( PageLeafEntry entry : entries ) { if ( entry . getCode ( ) != INSERT && entry . getExpires ( ) <= now ) { continue ; } while ( ! block . addEntry ( row , entry ) ) { block = new BlockLeaf ( getId ( ) ) ; blocks . add ( block ) ; } } PageLeafImpl newPage = new PageLeafImpl ( getId ( ) , getNextId ( ) , getSequence ( ) , _table , getMinKey ( ) , getMaxKey ( ) , blocks ) ; newPage . validate ( table ) ; newPage . toSorted ( table ) ; if ( isDirty ( ) ) { newPage . setDirty ( ) ; } if ( _stub != null ) { _stub . copyToCompact ( newPage ) ; } return newPage ; }
target:  Compacts the leaf by rebuilding the delta entries and discarding obsolete removed entries.