Support ORDER BY in CREATE DATABASE and multiple SETTINGS clauses

Changes:
- Add parsing for ORDER BY clause in CREATE DATABASE statements
- Add QuerySettings field to CreateQuery AST for second SETTINGS clause
- Update parser to store second SETTINGS in QuerySettings
- Update explain to output QuerySettings as Set at CreateQuery level
- Fixes 02184_default_table_engine stmt56 (CREATE DATABASE ORDER BY)
- Fixes 02184_default_table_engine stmt107 (multiple SETTINGS)

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

Author: kyleconroy

ast/ast.go

@@ -292,6 +292,7 @@ type CreateQuery struct {
 	SampleBy         Expression           `json:"sample_by,omitempty"`
 	TTL              *TTLClause           `json:"ttl,omitempty"`
 	Settings             []*SettingExpr       `json:"settings,omitempty"`
+	QuerySettings        []*SettingExpr       `json:"query_settings,omitempty"`          // Query-level SETTINGS (second SETTINGS clause)
 	SettingsBeforeComment bool                `json:"settings_before_comment,omitempty"` // True if SETTINGS comes before COMMENT
 	AsSelect         Statement            `json:"as_select,omitempty"`
 	AsTableFunction  Expression           `json:"as_table_function,omitempty"` // AS table_function(...) in CREATE TABLE

internal/explain/statements.go

@@ -226,6 +226,10 @@ func explainCreateQuery(sb *strings.Builder, n *ast.CreateQuery, indent string,
 	if n.Comment != "" && len(n.Settings) > 0 && !n.SettingsBeforeComment {
 		children++
 	}
+	// QuerySettings (second SETTINGS clause) is a separate child of CreateQuery
+	if len(n.QuerySettings) > 0 {
+		children++
+	}
 	// For materialized views with TO clause but no storage, count ViewTargets as a child
 	if n.Materialized && n.To != "" && !hasStorageChild {
 		children++ // ViewTargets
@@ -558,6 +562,10 @@ func explainCreateQuery(sb *strings.Builder, n *ast.CreateQuery, indent string,
 	if n.Comment != "" && len(n.Settings) > 0 && !n.SettingsBeforeComment {
 		fmt.Fprintf(sb, "%s Set\n", indent)
 	}
+	// Output QuerySettings (second SETTINGS clause) at CreateQuery level
+	if len(n.QuerySettings) > 0 {
+		fmt.Fprintf(sb, "%s Set\n", indent)
+	}
 }
 
 func explainDropQuery(sb *strings.Builder, n *ast.DropQuery, indent string, depth int) {

parser/parser.go

@@ -2692,7 +2692,13 @@ func (p *Parser) parseTableOptions(create *ast.CreateQuery) {
 				create.SettingsBeforeComment = true
 			}
 			p.nextToken()
-			create.Settings = p.parseSettingsList()
+			settings := p.parseSettingsList()
+			// If Settings is already set, this is a second SETTINGS clause (query-level)
+			if len(create.Settings) > 0 {
+				create.QuerySettings = settings
+			} else {
+				create.Settings = settings
+			}
 		case p.currentIs(token.COMMENT):
 			p.nextToken()
 			if p.currentIs(token.STRING) {
@@ -2742,6 +2748,22 @@ func (p *Parser) parseCreateDatabase(create *ast.CreateQuery) {
 		}
 		create.Engine = p.parseEngineClause()
 	}
+
+	// Handle ORDER BY clause (ClickHouse allows ORDER BY in CREATE DATABASE)
+	// This is stored as OrderBy for output in Storage definition
+	if p.currentIs(token.ORDER) {
+		p.nextToken() // skip ORDER
+		if p.currentIs(token.BY) {
+			p.nextToken() // skip BY
+		}
+		create.OrderBy = []ast.Expression{p.parseExpression(LOWEST)}
+	}
+
+	// Handle SETTINGS clause
+	if p.currentIs(token.SETTINGS) {
+		p.nextToken()
+		create.Settings = p.parseSettingsList()
+	}
 }
 
 func (p *Parser) parseCreateView(create *ast.CreateQuery) {

parser/testdata/02184_default_table_engine/metadata.json

@@ -1,6 +1 @@
-{
-  "explain_todo": {
-    "stmt107": true,
-    "stmt56": true
-  }
-}
+{}