fix flaky codex unit test
fix flaky codex unit test

codex_test.go uses createTableInfo func to create a TableInfo instance
for testing; however, it uses a map to store columns and then iterates
that map to add columns into TableInfo instance. This is not deterministic
because map iteration order is not guaranteed to be the insertion order.

tirsen/vitess,guokeno0/vitess,mapbased/vitess,mapbased/vitess,mahak/vitess,kmiku7/vitess-annotated,mapbased/vitess,netroby/vitess,cloudbearings/vitess,HubSpot/vitess,dumbunny/vitess,atyenoria/vitess,applift/vitess,mattharden/vitess,mlc0202/vitess,alainjobart/vitess,tjyang/vitess,alainjobart/vitess,kmiku7/vitess-annotated,atyenoria/vitess,guokeno0/vitess,davygeek/vitess,cgvarela/vitess,aaijazi/vitess,tjyang/vitess,kuipertan/vitess,cloudbearings/vitess,kuipertan/vitess,anusornc/vitess,enisoc/vitess,mlc0202/vitess,cgvarela/vitess,vitessio/vitess,skyportsystems/vitess,applift/vitess,cloudbearings/vitess,michael-berlin/vitess,applift/vitess,aaijazi/vitess,mapbased/vitess,ptomasroos/vitess,skyportsystems/vitess,dcadevil/vitess,yaoshengzhe/vitess,guokeno0/vitess,anusornc/vitess,HubSpot/vitess,sougou/vitess,erzel/vitess,enisoc/vitess,enisoc/vitess,nurblieh/vitess,cloudbearings/vitess,yaoshengzhe/vitess,erzel/vitess,yaoshengzhe/vitess,mahak/vitess,vitessio/vitess,pivanof/vitess,tjyang/vitess,yangzhongj/vitess,cloudbearings/vitess,tirsen/vitess,netroby/vitess,kmiku7/vitess-annotated,rnavarro/vitess,atyenoria/vitess,ptomasroos/vitess,applift/vitess,xgwubin/vitess,kuipertan/vitess,vitessio/vitess,atyenoria/vitess,xgwubin/vitess,michael-berlin/vitess,tinyspeck/vitess,SDHM/vitess,mlc0202/vitess,vitessio/vitess,nurblieh/vitess,mattharden/vitess,tjyang/vitess,dcadevil/vitess,fengshao0907/vitess,xgwubin/vitess,rnavarro/vitess,kmiku7/vitess-annotated,dumbunny/vitess,kuipertan/vitess,erzel/vitess,cgvarela/vitess,dumbunny/vitess,dcadevil/vitess,SDHM/vitess,anusornc/vitess,aaijazi/vitess,dumbunny/vitess,yangzhongj/vitess,fengshao0907/vitess,davygeek/vitess,davygeek/vitess,yangzhongj/vitess,michael-berlin/vitess,sougou/vitess,rnavarro/vitess,tinyspeck/vitess,xgwubin/vitess,HubSpot/vitess,mlc0202/vitess,netroby/vitess,atyenoria/vitess,mlc0202/vitess,yaoshengzhe/vitess,pivanof/vitess,guokeno0/vitess,tinyspeck/vitess,mahak/vitess,kuipertan/vitess,HubSpot/vitess,kuipertan/vitess,rnavarro/vitess,davygeek/vitess,davygeek/vitess,aaijazi/vitess,rnavarro/vitess,mapbased/vitess,netroby/vitess,yangzhongj/vitess,HubSpot/vitess,netroby/vitess,sougou/vitess,dumbunny/vitess,xgwubin/vitess,yangzhongj/vitess,mahak/vitess,netroby/vitess,nurblieh/vitess,kmiku7/vitess-annotated,mlc0202/vitess,ptomasroos/vitess,fengshao0907/vitess,dumbunny/vitess,fengshao0907/vitess,guokeno0/vitess,vitessio/vitess,SDHM/vitess,applift/vitess,AndyDiamondstein/vitess,mattharden/vitess,guokeno0/vitess,skyportsystems/vitess,mapbased/vitess,tirsen/vitess,michael-berlin/vitess,rnavarro/vitess,cgvarela/vitess,skyportsystems/vitess,skyportsystems/vitess,kuipertan/vitess,dumbunny/vitess,alainjobart/vitess,michael-berlin/vitess,yangzhongj/vitess,anusornc/vitess,erzel/vitess,mattharden/vitess,fengshao0907/vitess,mahak/vitess,atyenoria/vitess,tinyspeck/vitess,kmiku7/vitess-annotated,tjyang/vitess,tjyang/vitess,cloudbearings/vitess,cgvarela/vitess,applift/vitess,cloudbearings/vitess,mlc0202/vitess,mlc0202/vitess,erzel/vitess,sougou/vitess,AndyDiamondstein/vitess,atyenoria/vitess,alainjobart/vitess,yangzhongj/vitess,alainjobart/vitess,davygeek/vitess,erzel/vitess,sougou/vitess,michael-berlin/vitess,anusornc/vitess,tjyang/vitess,tinyspeck/vitess,kuipertan/vitess,tirsen/vitess,xgwubin/vitess,erzel/vitess,yaoshengzhe/vitess,tirsen/vitess,vitessio/vitess,tinyspeck/vitess,atyenoria/vitess,rnavarro/vitess,applift/vitess,sougou/vitess,dcadevil/vitess,mapbased/vitess,vitessio/vitess,cgvarela/vitess,HubSpot/vitess,nurblieh/vitess,SDHM/vitess,skyportsystems/vitess,tirsen/vitess,yaoshengzhe/vitess,mapbased/vitess,enisoc/vitess,AndyDiamondstein/vitess,ptomasroos/vitess,tjyang/vitess,xgwubin/vitess,fengshao0907/vitess,pivanof/vitess,mapbased/vitess,mattharden/vitess,enisoc/vitess,mahak/vitess,alainjobart/vitess,fengshao0907/vitess,guokeno0/vitess,mattharden/vitess,SDHM/vitess,sougou/vitess,SDHM/vitess,anusornc/vitess,dcadevil/vitess,HubSpot/vitess,AndyDiamondstein/vitess,kmiku7/vitess-annotated,dumbunny/vitess,nurblieh/vitess,ptomasroos/vitess,enisoc/vitess,HubSpot/vitess,vitessio/vitess,kuipertan/vitess,dcadevil/vitess,kmiku7/vitess-annotated,skyportsystems/vitess,netroby/vitess,AndyDiamondstein/vitess,cgvarela/vitess,AndyDiamondstein/vitess,guokeno0/vitess,tirsen/vitess,pivanof/vitess,SDHM/vitess,enisoc/vitess,AndyDiamondstein/vitess,aaijazi/vitess,skyportsystems/vitess,ptomasroos/vitess,nurblieh/vitess,fengshao0907/vitess,applift/vitess,michael-berlin/vitess,pivanof/vitess,aaijazi/vitess,erzel/vitess,anusornc/vitess,mapbased/vitess,AndyDiamondstein/vitess,cgvarela/vitess,dumbunny/vitess,applift/vitess,applift/vitess,tinyspeck/vitess,fengshao0907/vitess,rnavarro/vitess,kmiku7/vitess-annotated,tjyang/vitess,AndyDiamondstein/vitess,guokeno0/vitess,mattharden/vitess,mattharden/vitess,xgwubin/vitess,nurblieh/vitess,pivanof/vitess,sougou/vitess,yaoshengzhe/vitess,SDHM/vitess,nurblieh/vitess,tirsen/vitess,cloudbearings/vitess,mahak/vitess,yangzhongj/vitess,yaoshengzhe/vitess,aaijazi/vitess,alainjo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