Parse and output COMMENT clause for CREATE DICTIONARY

COMMENT was being parsed as token.COMMENT but the dictionary parsing loop
only handled PRIMARY and SETTINGS as keyword tokens. Added handling for
token.COMMENT in the loop and output the comment as a Literal in the
EXPLAIN AST.

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

Author: kyleconroy

internal/explain/statements.go

@@ -156,7 +156,7 @@ func explainCreateQuery(sb *strings.Builder, n *ast.CreateQuery, indent string,
 		return
 	}
 	if n.CreateDictionary {
-		// Dictionary: count children = database identifier (if any) + table identifier + attributes (if any) + definition (if any)
+		// Dictionary: count children = database identifier (if any) + table identifier + attributes (if any) + definition (if any) + comment (if any)
 		children := 1 // table identifier
 		hasDatabase := n.Database != ""
 		if hasDatabase {
@@ -168,6 +168,9 @@ func explainCreateQuery(sb *strings.Builder, n *ast.CreateQuery, indent string,
 		if n.DictionaryDef != nil {
 			children++
 		}
+		if n.Comment != "" {
+			children++
+		}
 		// Format: "CreateQuery [database] [table] (children N)"
 		if hasDatabase {
 			fmt.Fprintf(sb, "%sCreateQuery %s %s (children %d)\n", indent, n.Database, n.Table, children)
@@ -187,6 +190,10 @@ func explainCreateQuery(sb *strings.Builder, n *ast.CreateQuery, indent string,
 		if n.DictionaryDef != nil {
 			explainDictionaryDefinition(sb, n.DictionaryDef, indent+" ", depth+1)
 		}
+		// Dictionary COMMENT
+		if n.Comment != "" {
+			fmt.Fprintf(sb, "%s Literal \\'%s\\'\n", indent, n.Comment)
+		}
 		return
 	}
 

parser/parser.go

@@ -3890,6 +3890,15 @@ func (p *Parser) parseCreateDictionary(create *ast.CreateQuery) {
 			}
 			continue
 		}
+		// Handle COMMENT as a keyword token
+		if p.currentIs(token.COMMENT) {
+			p.nextToken() // skip COMMENT
+			if p.currentIs(token.STRING) {
+				create.Comment = p.current.Value
+				p.nextToken()
+			}
+			continue
+		}
 		if p.currentIs(token.IDENT) {
 			upper := strings.ToUpper(p.current.Value)
 			switch upper {

parser/testdata/02024_create_dictionary_with_comment/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt5": true
-  }
-}
+{}