func LoadDDLVars(ctx sessionctx.Context) error {
	return LoadGlobalVars(ctx, []string{variable.TiDBDDLErrorCountLimit})
}
LoadDDLVars loads ddl variable from mysql.global_variables.
package util
import (
	"fmt"
	"github.com/pingcap/errors"
	"github.com/pingcap/tidb/sessionctx"
	"github.com/pingcap/tidb/sessionctx/variable"
	"github.com/pingcap/tidb/util/sqlexec"
)
func LoadDDLReorgVars(ctx sessionctx.Context) error {
	return LoadGlobalVars(ctx, []string{variable.TiDBDDLReorgWorkerCount, variable.TiDBDDLReorgBatchSize})
}