Support column definitions in CREATE VIEW statements

Add parsing of column list after view name in CREATE VIEW, e.g.:
CREATE VIEW v (x UInt64) AS SELECT * FROM table

This enables views to specify column types for the view columns.

14 tests now pass with this fix.

Author: claude

parser/parser.go

@@ -1927,6 +1927,23 @@ func (p *Parser) parseCreateView(create *ast.CreateQuery) {
 		}
 	}
 
+	// Parse column definitions (e.g., CREATE VIEW v (x UInt64) AS SELECT ...)
+	if p.currentIs(token.LPAREN) {
+		p.nextToken()
+		for !p.currentIs(token.RPAREN) && !p.currentIs(token.EOF) {
+			col := p.parseColumnDeclaration()
+			if col != nil {
+				create.Columns = append(create.Columns, col)
+			}
+			if p.currentIs(token.COMMA) {
+				p.nextToken()
+			} else {
+				break
+			}
+		}
+		p.expect(token.RPAREN)
+	}
+
 	// Handle ON CLUSTER
 	if p.currentIs(token.ON) {
 		p.nextToken()

parser/testdata/01124_view_bad_types/metadata.json

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

parser/testdata/01798_uniq_theta_sketch/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt64": true
-  }
-}
+{}

parser/testdata/02184_default_table_engine/metadata.json

@@ -3,8 +3,6 @@
     "stmt107": true,
     "stmt114": true,
     "stmt26": true,
-    "stmt36": true,
-    "stmt37": true,
     "stmt46": true,
     "stmt56": true,
     "stmt61": true,

parser/testdata/02242_join_rocksdb/metadata.json

@@ -1,8 +1 @@
-{
-  "explain_todo": {
-    "stmt16": true,
-    "stmt18": true,
-    "stmt39": true,
-    "stmt40": true
-  }
-}
+{}

parser/testdata/02291_dictionary_scalar_subquery_reload/metadata.json

@@ -1,6 +1,5 @@
 {
   "explain_todo": {
-    "stmt10": true,
-    "stmt4": true
+    "stmt10": true
   }
 }

parser/testdata/02501_limits_on_result_for_view/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt6": true
-  }
-}
+{}

parser/testdata/02797_aggregator_huge_mem_usage_bug/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt2": true
-  }
-}
+{}

parser/testdata/02842_truncate_database/metadata.json

@@ -1,10 +1,5 @@
 {
   "explain_todo": {
-    "stmt16": true,
-    "stmt17": true,
-    "stmt18": true,
-    "stmt19": true,
-    "stmt20": true,
     "stmt32": true,
     "stmt33": true,
     "stmt43": true

parser/testdata/02916_set_formatting/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt6": true
-  }
-}
+{}