question: public void initMetaData ( FrameBlock meta ) { if ( meta == null || meta . getNumRows ( ) <= 0 ) return ; for ( int j = 0 ; j < _colList . length ; j ++ ) { int colID = _colList [ j ] ; _rcdMaps . put ( colID , meta . getRecodeMap ( colID - 1 ) ) ; } }
target:  Construct the recodemaps from the given input frame for all  columns registered for recode.