Fix column declaration child order in EXPLAIN output

Reorder column declaration children to match ClickHouse's EXPLAIN AST:
1. Type
2. Settings (SETTINGS clause)
3. Default value
4. TTL
5. Codec
6. Statistics
7. Comment

Previously Settings was output after TTL and Statistics, but ClickHouse
outputs it right after the type.

Fixes test: 03270_fix_column_modifier_write_order/stmt3

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

internal/explain/explain.go

@@ -357,8 +357,9 @@ func Column(sb *strings.Builder, col *ast.ColumnDeclaration, depth int) {
 	if col.Type != nil {
 		Node(sb, col.Type, depth+1)
 	}
-	if len(col.Statistics) > 0 {
-		explainStatisticsExpr(sb, col.Statistics, indent+" ", depth+1)
+	// Settings comes right after Type in ClickHouse EXPLAIN output
+	if len(col.Settings) > 0 {
+		fmt.Fprintf(sb, "%s Set\n", indent)
 	}
 	if col.Default != nil {
 		Node(sb, col.Default, depth+1)
@@ -372,8 +373,8 @@ func Column(sb *strings.Builder, col *ast.ColumnDeclaration, depth int) {
 	if col.Codec != nil {
 		explainCodecExpr(sb, col.Codec, indent+" ", depth+1)
 	}
-	if len(col.Settings) > 0 {
-		fmt.Fprintf(sb, "%s Set\n", indent)
+	if len(col.Statistics) > 0 {
+		explainStatisticsExpr(sb, col.Statistics, indent+" ", depth+1)
 	}
 	if col.Comment != "" {
 		fmt.Fprintf(sb, "%s Literal \\'%s\\'\n", indent, col.Comment)

parser/testdata/03270_fix_column_modifier_write_order/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt3": true
-  }
-}
+{}