Method invocation on nil value

[jsumners-nr]

Invoking the NRQL script:

from NodeMetadataSummary
select *

Will result in an error:

❯ ~/bin/newrelic nrql query --format Text --query _table_desc.nrql
panic: reflect: call of reflect.Value.Interface on zero Value

goroutine 1 [running]:
reflect.valueInterface({0x0?, 0x0?, 0x1400026e008?}, 0xa0?)
	/Users/jsumners/.go/src/reflect/value.go:1501 +0xfc
reflect.Value.Interface(...)
	/Users/jsumners/.go/src/reflect/value.go:1496
github.com/newrelic/newrelic-cli/internal/output.(*Output).createTableFromMapSlice(0x140003100a0, {0x101153730, 0x1400017c5a0}, {0x100f94100?, 0x14000434660?, 0x14000634000?})
	/Users/jsumners/Projects/newrelic-cli/internal/output/text.go:170 +0x3fc
github.com/newrelic/newrelic-cli/internal/output.(*Output).renderAsTable(0x140003100a0, {0x100f94100, 0x14000434660})
	/Users/jsumners/Projects/newrelic-cli/internal/output/text.go:60 +0x220
github.com/newrelic/newrelic-cli/internal/output.(*Output).text(0x18?, {0x100f94100?, 0x14000434660?})
	/Users/jsumners/Projects/newrelic-cli/internal/output/text.go:29 +0x94
github.com/newrelic/newrelic-cli/internal/output.Print({0x100f94100?, 0x14000434660?})
	/Users/jsumners/Projects/newrelic-cli/internal/output/print.go:19 +0xf0
github.com/newrelic/newrelic-cli/internal/nrql.init.func2(0x1400033e900?, {0x100d7e1c9?, 0x4?, 0x100d7e1cd?})
	/Users/jsumners/Projects/newrelic-cli/internal/nrql/command_query.go:53 +0x1e4
github.com/spf13/cobra.(*Command).execute(0x101738120, {0x140003205c0, 0x4, 0x4})
	/Users/jsumners/go/pkg/mod/github.com/spf13/cobra@v1.7.0/command.go:944 +0x63c
github.com/spf13/cobra.(*Command).ExecuteC(0x10172b500)
	/Users/jsumners/go/pkg/mod/github.com/spf13/cobra@v1.7.0/command.go:1068 +0x320
github.com/spf13/cobra.(*Command).Execute(...)
	/Users/jsumners/go/pkg/mod/github.com/spf13/cobra@v1.7.0/command.go:992
main.Execute()
	/Users/jsumners/Projects/newrelic-cli/cmd/newrelic/command.go:74 +0x104
main.main()
	/Users/jsumners/Projects/newrelic-cli/cmd/newrelic/main.go:66 +0x1

The issue is at:

newrelic-cli/internal/output/text.go

Lines 167 to 172 in 757304c

	for j, k := range sortedKeys {
	if key := findStringValue(k, keys); key != nil {
	val := v.Index(i).MapIndex(*key)
	row[j] = val.Interface()
	}
	}

A fix for it is:

		for j, k := range sortedKeys {
			if key := findStringValue(k, keys); key != nil {
				val := v.Index(i).MapIndex(*key)
				if !val.IsValid() {
					row[j] = ""
				} else {
					row[j] = val.Interface()
				}
			}
		}

However, that just skirts around the problem. The actual problem is that each row in the result set does not necessarily have the same number of columns. I have dealt with a similar problem like so: https://github.com/newrelic/newrelic-node-versions/blob/8e4873e3eafe6071a3aa3873acd12a96932390c8/ai-monitoring-tmpl.go#L146-L181