you should use filterPredicate property of MatTableDataSource

you should use filterPredicate property of MatTableDataSource

初始化this.dataSource后，定义一个自定义filterPredicate函数如下；

after you initialize this.dataSource, define a custom filterPredicate function as follows;

this.dataSource = new MatTableDataSource(results);
this.dataSource.sort = this.sort;
this.dataSource.filterPredicate = function(data: any, filterValue: string) {
  return data.specificColumn /** replace this with the column name you want to filter */
    .trim()
    .toLocaleLowerCase().indexOf(filterValue.trim().toLocaleLowerCase()) >= 0;
};