Add JsonPath field for OPENROWSET column JSON path mappings

- Add JsonPath field to OpenRowsetColumnDefinition AST
- Store string path expressions ('$.column') in JsonPath instead of ColumnOrdinal
- Update marshaling to output JsonPath field

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

Author: kyleconroy

ast/openrowset.go

@@ -46,6 +46,7 @@ func (o *OpenRowsetTableReference) tableReference() {}
 // OpenRowsetColumnDefinition represents a column definition in WITH clause.
 type OpenRowsetColumnDefinition struct {
 	ColumnOrdinal    ScalarExpression  `json:"ColumnOrdinal,omitempty"`
+	JsonPath         ScalarExpression  `json:"JsonPath,omitempty"`
 	ColumnIdentifier *Identifier       `json:"ColumnIdentifier,omitempty"`
 	DataType         DataTypeReference `json:"DataType,omitempty"`
 	Collation        *Identifier       `json:"Collation,omitempty"`

parser/marshal.go

@@ -20057,6 +20057,9 @@ func openRowsetColumnDefinitionToJSON(col *ast.OpenRowsetColumnDefinition) jsonN
 	node := jsonNode{
 		"$type": "OpenRowsetColumnDefinition",
 	}
+	if col.JsonPath != nil {
+		node["JsonPath"] = scalarExpressionToJSON(col.JsonPath)
+	}
 	if col.ColumnOrdinal != nil {
 		node["ColumnOrdinal"] = scalarExpressionToJSON(col.ColumnOrdinal)
 	}

parser/parse_dml.go

@@ -843,7 +843,7 @@ func (p *Parser) parseBulkOpenRowset() (*ast.BulkOpenRowset, error) {
 					p.nextToken()
 				} else if p.curTok.Type == TokenString {
 					// JSON path specification like '$.stateName' or 'strict $.population'
-					colDef.ColumnOrdinal = &ast.StringLiteral{
+					colDef.JsonPath = &ast.StringLiteral{
 						LiteralType:   "String",
 						IsNational:    false,
 						IsLargeObject: false,

parser/testdata/Baselines160_OpenRowsetStatementTests160/metadata.json

@@ -1 +1 @@
-{"todo": true}
+{}

parser/testdata/OpenRowsetStatementTests160/metadata.json

@@ -1 +1 @@
-{"todo": true}
+{}