Columnar: better specification for microbenchmark. (#4711)
Columnar: better specification for microbenchmark. (#4711)

Co-authored-by: Jeff Davis <d063fb5786fc317fc556afe7a2c7607d0cfea938@microsoft.com>
citusdata/citus,citusdata/citus,citusdata/citus,citusdata/citus,citusdata/citus