func SetPartitionRule(instanceIDSize, schemaIDSize, tableIDSize int) {
	instanceIDBitSize = instanceIDSize
	schemaIDBitSize = schemaIDSize
	tableIDBitSize = tableIDSize
	maxOriginID = 1 << uint(64-instanceIDSize-schemaIDSize-tableIDSize-1)
}
SetPartitionRule sets bit size of schema ID and table ID
package column
import (
	"fmt"
	"strconv"
	"strings"
	"sync"
	"github.com/pingcap/errors"
	selector "github.com/pingcap/tidb-tools/pkg/table-rule-selector"
)
var (
	instanceIDBitSize       = 4
	schemaIDBitSize         = 7
	tableIDBitSize          = 8
	maxOriginID       int64 = 17592186044416
)