column auto merge have minor wrong behavior

[naughtyGitCat]

Describe the bug
wrong merge upper non-empty with downside empty content

To Reproduce

func RenderResources(serviceName string) table.Writer {
	resources, err := service.GetServiceResources(serviceName)
	if err != nil {
		log.Fatal(err)
	}
	t := table.NewWriter()
	t.SetOutputMirror(os.Stdout)
	rowConfigAutoMerge := table.RowConfig{AutoMerge: true}
	tableHeader := table.Row{"环境", "拓补", "地址", "物理IP", "备注"}
	t.AppendHeader(tableHeader)
	for _, resource := range resources {
		t.AppendRow(table.Row{resource.EntranceEnvironment, resource.DBTopologyType, generateUri(resource), resource.EntranceIP, generateComment(resource)},
			rowConfigAutoMerge)
	}
	var columnConfigs []table.ColumnConfig
	for i, _ := range tableHeader {
		columnConfigs = append(columnConfigs, table.ColumnConfig{
			Number:      i + 1,
			AutoMerge:   true,
			VAlign:      text.VAlignMiddle,
			Align:       text.AlignCenter,
			AlignHeader: text.AlignCenter,
		})
	}
	t.SetAutoIndex(true)
	t.SetColumnConfigs(columnConfigs)
	t.SetStyle(table.StyleLight)
	t.Style().Options.SeparateRows = true
	return t
}

Expected behavior
upper non-empty separate from downside empty content when column auto merge enabled

Screenshots

Software (please complete the following information):

• OS: 2.6.32-573.el6.x86_64
• GoLang Version go version go1.21.3 darwin/arm64

Additional context
Add any other context about the problem here.

[jedib0t]

I was able to reproduce the bug with this:

package main

import (
	"os"

	"github.com/jedib0t/go-pretty/v6/table"
	"github.com/jedib0t/go-pretty/v6/text"
)

func main() {
	t := table.NewWriter()
	t.SetOutputMirror(os.Stdout)
	rowConfigAutoMerge := table.RowConfig{AutoMerge: true}
	tableHeader := table.Row{"Col #1", "Col #2", "Col #3", "Col #4", "Col #5"}
	t.AppendHeader(tableHeader)
	t.AppendRow(table.Row{"Product", "Standalone", "foo bar", "1.1.1.1", ""}, rowConfigAutoMerge)
	t.AppendRow(table.Row{"Test", "Standalone", "bar baz", "2.2.2.2", ""}, rowConfigAutoMerge)
	t.AppendRow(table.Row{"Product", "RedisCluster", "foo baz", "", "Cluster #1"}, rowConfigAutoMerge)
	t.AppendRow(table.Row{"Product", "RedisCluster", "bar baz", "", "Cluster #2"}, rowConfigAutoMerge)

	var columnConfigs []table.ColumnConfig
	for i, _ := range tableHeader {
		columnConfigs = append(columnConfigs, table.ColumnConfig{
			Number:      i + 1,
			AutoMerge:   true,
			VAlign:      text.VAlignMiddle,
			Align:       text.AlignCenter,
			AlignHeader: text.AlignCenter,
		})
	}
	t.SetAutoIndex(true)
	t.SetColumnConfigs(columnConfigs)
	t.SetStyle(table.StyleLight)
	t.Style().Options.SeparateRows = true
	t.Render()
}

Output:

┌───┬─────────┬──────────────┬─────────┬─────────┬────────────┐
│   │  COL #1 │    COL #2    │  COL #3 │  COL #4 │   COL #5   │
├───┼─────────┼──────────────┼─────────┼─────────┼────────────┤
│ 1 │ Product │  Standalone  │ foo bar │ 1.1.1.1 │            │
├───┼─────────┤              ├─────────┼─────────┤            │
│ 2 │   Test  │              │ bar baz │ 2.2.2.2 │            │
├───┼─────────┼──────────────┼─────────┤         ├────────────┤
│ 3 │ Product │ RedisCluster │ foo baz │         │ Cluster #1 │
├───┤         │              ├─────────┤         ├────────────┤
│ 4 │         │              │ bar baz │         │ Cluster #2 │
└───┴─────────┴──────────────┴─────────┴─────────┴────────────┘

Will work on a solution for this soon.

[jedib0t]

@naughtyGitCat try https://github.com/jedib0t/go-pretty/releases/tag/v6.4.9 - this should fix your issue.

[naughtyGitCat]

thanks, it fixed