Client unable to select from function when compression is enabled.

[jnewmano]

Adding the following test to client/client_test.go results in an error. Selecting any computed function fails.

func (s *clientTestSuite) TestConn_Compress() {
	addr := fmt.Sprintf("%s:%s", *test_util.MysqlHost, s.port)
	conn, err := Connect(addr, *testUser, *testPassword, "", func(conn *Conn) {
		conn.SetCapability(mysql.CLIENT_COMPRESS)
	})
	require.NoError(s.T(), err)

	_, err = conn.Execute("SELECT VERSION()")
	require.NoError(s.T(), err)
}

$ go test -v ./client --user root --pass <redacted> --run TestClientSuite/TestConn_Compress
=== RUN   TestClientSuite
=== RUN   TestClientSuite/TestConn_Compress
    client_test.go:260: 
                Error Trace:    /Users/jason/go/src/github.com/jnewmano/go-mysql/client/client_test.go:260
                Error:          Received unexpected error:
                                invalid compressed sequence 2 != 1
                                github.com/go-mysql-org/go-mysql/packet.(*Conn).newCompressedPacketReader
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/packet/conn.go:152
                                github.com/go-mysql-org/go-mysql/packet.(*Conn).ReadPacketReuseMem
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/packet/conn.go:111
                                github.com/go-mysql-org/go-mysql/client.(*Conn).readResultColumns
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/client/resp.go:345
                                github.com/go-mysql-org/go-mysql/client.(*Conn).readResultset
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/client/resp.go:291
                                github.com/go-mysql-org/go-mysql/client.(*Conn).readResult
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/client/resp.go:236
                                github.com/go-mysql-org/go-mysql/client.(*Conn).exec
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/client/conn.go:468
                                github.com/go-mysql-org/go-mysql/client.(*Conn).Execute
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/client/conn.go:252
                                github.com/go-mysql-org/go-mysql/client.(*clientTestSuite).TestConn_Compress
                                        /Users/jason/go/src/github.com/jnewmano/go-mysql/client/client_test.go:259
                                reflect.Value.call
                                        /opt/homebrew/Cellar/go/1.22.1/libexec/src/reflect/value.go:596
                                reflect.Value.Call
                                        /opt/homebrew/Cellar/go/1.22.1/libexec/src/reflect/value.go:380
                                github.com/stretchr/testify/suite.Run.func1
                                        /Users/jason/go/pkg/mod/github.com/stretchr/[email protected]/suite/suite.go:197
                                testing.tRunner
                                        /opt/homebrew/Cellar/go/1.22.1/libexec/src/testing/testing.go:1689
                                runtime.goexit
                                        /opt/homebrew/Cellar/go/1.22.1/libexec/src/runtime/asm_arm64.s:1222
                Test:           TestClientSuite/TestConn_Compress
--- FAIL: TestClientSuite (0.04s)
    --- FAIL: TestClientSuite/TestConn_Compress (0.01s)
FAIL
FAIL    github.com/go-mysql-org/go-mysql/client 0.176s
FAIL

Client compression with computed function select worked in PR #862 at commit 22dbb42, something in a later commit resulted in an error in these types of queries.

[dvilaverde]

Thanks @jnewmano will take a look.

[dvilaverde]

@jnewmano I've created a PR to fix this issue, #872.

I've also added your test case as well.

[lance6716]

Sorry for my code suggestion in the previous PR

[dvilaverde]

Sorry for my code suggestion in the previous PR

It's quite alright it happens. I didn't realize that boolean had such an important role until this issue was reported. I added a comment thought to make it clear for the next person.

[dvilaverde]

Please close this issue, this issue has been fixed. Thanks!