render: sql table with only header

ci/release/changelogs/next.md

@@ -11,3 +11,4 @@
 - Restricts where `near` key constant values can be used, with good error messages, instead of erroring (e.g. setting `near: top-center` on a container would cause bad layouts or error). [#538](https://github.com/terrastruct/d2/pull/538)
 - Fixes an error during ELK layout when images had empty labels. [#555](https://github.com/terrastruct/d2/pull/555)
 - Fixes rendering classes and tables with empty headers. [#498](https://github.com/terrastruct/d2/pull/498)
+- Fixes rendering sql tables with no columns. [#553](https://github.com/terrastruct/d2/pull/553)

d2graph/d2graph.go

@@ -805,7 +805,9 @@ func (obj *Object) GetDefaultSize(mtexts []*d2target.MText, ruler *textmeasure.R
 
 		// The rows get padded a little due to header font being larger than row font
 		dims.Height = labelDims.Height * (len(obj.SQLTable.Columns) + 1)
-		dims.Width = d2target.NamePadding + maxNameWidth + d2target.TypePadding + maxTypeWidth + d2target.TypePadding + constraintWidth
+		headerWidth := d2target.HeaderPadding + labelDims.Width + d2target.HeaderPadding
+		rowsWidth := d2target.NamePadding + maxNameWidth + d2target.TypePadding + maxTypeWidth + d2target.TypePadding + constraintWidth
+		dims.Width = go2.Max(headerWidth, rowsWidth)
 	}
 
 	return &dims, nil

d2renderers/d2svg/table.go

@@ -19,8 +19,8 @@ func tableHeader(shape d2target.Shape, box *geo.Box, text string, textWidth, tex
 	if text != "" {
 		tl := label.InsideMiddleLeft.GetPointOnBox(
 			box,
-			20,
-			textWidth,
+			float64(d2target.HeaderPadding),
+			float64(shape.Width),
 			textHeight,
 		)
 

d2target/sqltable.go

@@ -3,8 +3,9 @@ package d2target
 import "oss.terrastruct.com/d2/d2renderers/d2fonts"
 
 const (
-	NamePadding = 10
-	TypePadding = 20
+	NamePadding   = 10
+	TypePadding   = 20
+	HeaderPadding = 20
 )
 
 type SQLTable struct {

e2etests/regression_test.go

@@ -262,6 +262,26 @@ ico: {
 	label: ""
 	icon: https://icons.terrastruct.com/infra/019-network.svg
 }
+`,
+		},
+		{
+			name: "only_header_class_table",
+			script: `
+
+class: RefreshAuthorizationPolicyProtocolServerSideTranslatorProtocolBuffer {
+	shape: class
+}
+
+table: RefreshAuthorizationPolicyCache {
+	shape: sql_table
+}
+
+table with short col: RefreshAuthorizationPolicyCache {
+	shape: sql_table
+	ok
+}
+
+class -> table -> table with short col
 `,
 		},
 	}