return nil, errIncorrectSQLFunctionArgumentType(err)
	}

	// Assemble other arguments
	arg2, arg3 := e.From, e.For
	// Check if the second form of substring is being used
	if e.From == nil {
		arg2, arg3 = e.Arg2, e.Arg3
	}

	// Evaluate the FROM argument
	v2, err := arg2.evalNode(r, tableAlias)
	if err != nil {
		return nil, err
	}
	inferTypeForArithOp(v2)

type SubstringFunc struct {
	Expr *PrimaryTerm `parser:" \"SUBSTRING\" \"(\" @@ "`
	From *Operand     `parser:" ( \"FROM\" @@ "`
	For  *Operand     `parser:"   (\"FOR\" @@)? \")\" "`
	Arg2 *Operand     `parser:" | \",\" @@ "`
	Arg3 *Operand     `parser:"   (\",\" @@)? \")\" )"`
}

// ExtractFunc represents EXTRACT sql function
type ExtractFunc struct {

		switch {
		case e.Substring.From != nil:
			result.combine(e.Substring.From.analyze(s))
			if e.Substring.For != nil {
				result.combine(e.Substring.Expr.analyze(s))
			}
		case e.Substring.Arg2 != nil:
			result.combine(e.Substring.Arg2.analyze(s))
			if e.Substring.Arg3 != nil {
				result.combine(e.Substring.Arg3.analyze(s))
			}
		default:
			result.err = errVal
		}
		return result

	case sqlFnUTCNow:

	ReplicationStatusInternal string                 // stringified representation of all replication activity
	// VersionPurgeStatusInternal is internally in the format "arn1=PENDING;arn2=COMPLETED;"
	VersionPurgeStatusInternal string                            // stringified representation of all version purge statuses

			},
			{
				Arn:                   "arn2",
				Size:                  249,
				PrevReplicationStatus: replication.Pending,
				ReplicationStatus:     replication.Failed,
				OpType:                replication.ObjectReplicationType,
				ReplicationAction:     replicateAll,
			},
		},
		expectedCompletedSize:             249,
		expectedReplicationStatusInternal: "arn1=COMPLETED;arn2=FAILED;",