Crash by Function DAYNAME

[suyZhong]

The following test case crashed go-mysql-server.

CREATE TABLE t0(c2 INT, c3 INT, PRIMARY KEY(c2));
INSERT INTO t0(c2) VALUES (1);
INSERT INTO t0(c2) VALUES (2);

SELECT c2 FROM t0 WHERE c2 ORDER BY DAYNAME(c3) ASC;

Here's my error trace:

panic: interface conversion: interface {} is nil, not time.Time

goroutine 611 [running]:
github.com/dolthub/go-mysql-server/sql/expression/function.(*DayName).Eval(0x0?, 0x0?, {0xc0017aebe0?, 0xc000d52e88?, 0xc000baf800?})
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/expression/function/time.go:1198 +0x1e5
github.com/dolthub/go-mysql-server/sql/expression.(*Sorter).Less(0xc000fff810, 0x18?, 0x0?)
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/expression/sort.go:48 +0x17e
sort.insertionSort({0x30362e0, 0xc000fff810}, 0x0, 0x2)
        /home/suyang/go/src/sort/zsortinterface.go:12 +0xa7
sort.stable({0x30362e0, 0xc000fff810}, 0x2)
        /home/suyang/go/src/sort/zsortinterface.go:343 +0x6a
sort.Stable({0x30362e0, 0xc000fff810})
        /home/suyang/go/src/sort/sort.go:229 +0x34
github.com/dolthub/go-mysql-server/sql/rowexec.(*sortIter).computeSortedRows(0xc000fff680, 0xc000df0d20)
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/rowexec/rel_iters.go:1007 +0x248
github.com/dolthub/go-mysql-server/sql/rowexec.(*sortIter).Next(0xc000fff680, 0x58?)
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/rowexec/rel_iters.go:961 +0x25
github.com/dolthub/go-mysql-server/sql/rowexec.(*projectIter).Next(0xc000d34120, 0x1?)
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/rowexec/rel_iters.go:512 +0x29
github.com/dolthub/go-mysql-server/sql/rowexec.transactionCommittingIter.Next(...)
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/rowexec/transaction_iters.go:78
github.com/dolthub/go-mysql-server/sql/plan.(*trackedRowIter).Next(0xc000bc75c0, 0x100000000?)
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/sql/plan/process.go:347 +0x24
github.com/dolthub/go-mysql-server/server.(*Handler).doQuery.func2()
        /home/suyang/go/pkg/mod/github.com/dolthub/[email protected]/server/handler.go:286 +0x125
golang.org/x/sync/errgroup.(*Group).Go.func1()
        /home/suyang/go/pkg/mod/golang.org/x/[email protected]/errgroup/errgroup.go:75 +0x56
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 554
        /home/suyang/go/pkg/mod/golang.org/x/[email protected]/errgroup/errgroup.go:72 +0x96

I originally find this by building dolt from source version f400a12. It could also be reproduced in 1.26.1.