Bigtable/src/Admin/V2/GcRule.php
public function setUnion($var)
    {
        GPBUtil::checkMessage($var, \Google\Cloud\Bigtable\Admin\V2\GcRule_Union::class);
        $this->writeOneof(4, $var);

        return $this;
    }
public function setUnion($var)
    {
        GPBUtil::checkMessage($var, \Google\Cloud\Bigtable\Admin\V2\GcRule_Union::class);
        $this->writeOneof(4, $var);

        return $this;
    }
public function setUnion ( $ var ) { GPBUtil :: checkMessage ( $ var , \ Google \ Cloud \ Bigtable \ Admin \ V2 \ GcRule_Union :: class ) ; $ this -> writeOneof ( 4 , $ var ) ; return $ this ; }
Delete cells that would be deleted by any nested rule.

Generated from protobuf field <code>.google.bigtable.admin.v2.GcRule.Union union = 4;</code>
@param \Google\Cloud\Bigtable\Admin\V2\GcRule\Union $var
@return $this
Delete cells that would be deleted by any nested rule .