have MatrixRowsTable preserve partitionCounts() information from MatrixIR (#3877)
have MatrixRowsTable preserve partitionCounts() information from MatrixIR (#3877)


hail-is/hail,cseed/hail,danking/hail,danking/hail,danking/hail,hail-is/hail,danking/hail,hail-is/hail,hail-is/hail,danking/hail,cseed/hail,cseed/hail,cseed/hail,danking/hail,hail-is/hail,cseed/hail,cseed/hail,hail-is/hail,danking/hail,cseed/hail,hail-is/hail,hail-is/hail,danking/hail,cseed/hail