Panic due to invalid cast

[macneale4]

$ dolt init
$ dolt sql -q "show variables where 'blah'"

Should probably result in an error message like can't convert a string to a boolean. Instead, I get this panic:

$ dolt sql -q "show variables where 'blah'";
panic: interface conversion: interface {} is string, not bool

goroutine 1 [running]:
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).buildShowVariables(0x14000692990?, 0x14000c5ff40, 0x140006927b0, {0x1051829e0?, 0x1053c4628?, 0xb1b0?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/show.go:532 +0x358
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).buildNodeExec(0x40?, 0x104f4ac00?, {0x1053c4238?, 0x140006927b0?}, {0x0?, 0x0, 0x0})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/node_builder.gen.go:105 +0xddc
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).Build(...)
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/builder.go:33
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).buildTransactionCommittingNode(0x140016aec68?, 0x104158ad0?, 0x140016aed68?, {0x0?, 0x14000c5ff40?, 0x0?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/transaction.go:305 +0x3c
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).buildNodeExec(0x1053c3788?, 0x14000692990?, {0x1053c4628?, 0x1400069b1b0?}, {0x0?, 0x1053c3788?, 0x14000692990?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/node_builder.gen.go:37 +0x114
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).Build(...)
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/builder.go:33
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).buildQueryProcess(0x0?, 0x10538b158?, 0x14000692990, {0x0?, 0xfbcfee6c25819b65?, 0xd64de8fe152d4009?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/other.go:356 +0x40
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).buildNodeExec(0x140000000f5?, 0x1053a6438?, {0x1053c3788?, 0x14000692990?}, {0x0?, 0x104201840?, 0x14000c6b688?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/node_builder.gen.go:43 +0x1a4
github.com/dolthub/go-mysql-server/sql/rowexec.(*BaseBuilder).Build(0x140001b1ae0?, 0x14000c5ff40?, {0x1053c3788?, 0x14000692990?}, {0x0?, 0x140006927b0?, 0x140016b0001?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/sql/rowexec/builder.go:33 +0x28
github.com/dolthub/go-mysql-server.(*Engine).QueryNodeWithBindings(0x140001b1ae0, 0x14000c5ff40, {0x140001e6be0, 0x1b}, {0x0?, 0x0?}, 0xf0?)
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/engine.go:311 +0x25c
github.com/dolthub/go-mysql-server.(*Engine).QueryWithBindings(...)
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/engine.go:249
github.com/dolthub/go-mysql-server.(*Engine).Query(0x140016af258?, 0x102c5ddf4?, {0x140001e6be0?, 0x140016af278?})
        /Users/neil/go/pkg/mod/github.com/dolthub/go-mysql-server@v0.16.1-0.20230718175229-3072091ce8c9/engine.go:244 +0x2c
github.com/dolthub/dolt/go/cmd/dolt/commands/engine.(*SqlEngine).Query(0x140016af288?, 0x102c711f0?, {0x140001e6be0?, 0x105350880?})
        /Users/neil/Documents/dolt/go/cmd/dolt/commands/engine/sqlengine.go:248 +0x24
github.com/dolthub/dolt/go/cmd/dolt/commands.processParsedQuery(0x140001e6be0?, {0x140001e6be0?, 0x1b?}, {0x1053995e0?, 0x1400009a4b0?}, {0x1053a8800?, 0x140003901e0?})
        /Users/neil/Documents/dolt/go/cmd/dolt/commands/sql.go:1007 +0x3c0
github.com/dolthub/dolt/go/cmd/dolt/commands.execBatchMode(0x14000c5ff40, {0x1053995e0, 0x1400009a4b0}, {0x10539fb20?, 0x14000cb8f60}, 0x0, 0x0?)
        /Users/neil/Documents/dolt/go/cmd/dolt/commands/sql.go:634 +0x3b0
github.com/dolthub/dolt/go/cmd/dolt/commands.queryMode(0x10500f160?, {0x1053995e0, 0x1400009a4b0}, 0x4?, {0x16d1f7754, 0x1b}, 0x2?, 0x2?)
        /Users/neil/Documents/dolt/go/cmd/dolt/commands/sql.go:388 +0xc4
github.com/dolthub/dolt/go/cmd/dolt/commands.SqlCmd.Exec({{0x104538844?, 0x156373ee879df78e?}}, {0x1053b3a28, 0x1400057a4b0}, {0x14000c6b2e0, 0x8}, {0x140001a4060, 0x2, 0x2}, 0x140006c3ef0, ...)
        /Users/neil/Documents/dolt/go/cmd/dolt/commands/sql.go:210 +0x3f8
github.com/dolthub/dolt/go/cmd/dolt/cli.SubCommandHandler.handleCommand({{0x104537dc7, 0x4}, {0x1045576a7, 0x11}, {0x0, 0x0}, {0x107cca0e0, 0x32, 0x32}, 0x0}, ...)
        /Users/neil/Documents/dolt/go/cmd/dolt/cli/command.go:244 +0x3e8
github.com/dolthub/dolt/go/cmd/dolt/cli.SubCommandHandler.Exec({{0x104537dc7, 0x4}, {0x1045576a7, 0x11}, {0x0, 0x0}, {0x107cca0e0, 0x32, 0x32}, 0x0}, ...)
        /Users/neil/Documents/dolt/go/cmd/dolt/cli/command.go:193 +0x258
main.runMain()
        /Users/neil/Documents/dolt/go/cmd/dolt/dolt.go:542 +0x23f4
main.main()
        /Users/neil/Documents/dolt/go/cmd/dolt/dolt.go:201 +0x1c

[jycor]

Fix is merged and making its way to dolt main.