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Add CTE (Common Table Expression) parsing support
Add support for WITH clause containing: - CHANGE_TRACKING_CONTEXT expression - CTEs with name, optional columns, and query expression Add WithCtesAndXmlNamespaces field to: - InsertStatement - UpdateStatement - DeleteStatement Enabled tests: - Baselines100_CTEStatementTests100 - CTEStatementTests100
1 parent f8fb162 commit 182e749

9 files changed

Lines changed: 182 additions & 8 deletions

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‎ast/cte.go‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,18 @@
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package ast
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// WithCtesAndXmlNamespaces represents the WITH clause containing CTEs and/or XML namespaces.
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type WithCtesAndXmlNamespaces struct {
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CommonTableExpressions []*CommonTableExpression `json:"CommonTableExpressions,omitempty"`
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ChangeTrackingContext ScalarExpression `json:"ChangeTrackingContext,omitempty"`
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}
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func (w *WithCtesAndXmlNamespaces) node() {}
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// CommonTableExpression represents a single CTE definition.
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type CommonTableExpression struct {
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ExpressionName *Identifier `json:"ExpressionName,omitempty"`
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Columns []*Identifier `json:"Columns,omitempty"`
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QueryExpression QueryExpression `json:"QueryExpression,omitempty"`
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}
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func (c *CommonTableExpression) node() {}

‎ast/delete_statement.go‎

Lines changed: 3 additions & 2 deletions
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@@ -2,8 +2,9 @@ package ast
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// DeleteStatement represents a DELETE statement.
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type DeleteStatement struct {
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DeleteSpecification *DeleteSpecification `json:"DeleteSpecification,omitempty"`
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OptimizerHints []OptimizerHintBase `json:"OptimizerHints,omitempty"`
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DeleteSpecification *DeleteSpecification `json:"DeleteSpecification,omitempty"`
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WithCtesAndXmlNamespaces *WithCtesAndXmlNamespaces `json:"WithCtesAndXmlNamespaces,omitempty"`
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OptimizerHints []OptimizerHintBase `json:"OptimizerHints,omitempty"`
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}
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func (d *DeleteStatement) node() {}

‎ast/insert_statement.go‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2,8 +2,9 @@ package ast
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// InsertStatement represents an INSERT statement.
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type InsertStatement struct {
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InsertSpecification *InsertSpecification `json:"InsertSpecification,omitempty"`
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OptimizerHints []OptimizerHintBase `json:"OptimizerHints,omitempty"`
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InsertSpecification *InsertSpecification `json:"InsertSpecification,omitempty"`
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WithCtesAndXmlNamespaces *WithCtesAndXmlNamespaces `json:"WithCtesAndXmlNamespaces,omitempty"`
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OptimizerHints []OptimizerHintBase `json:"OptimizerHints,omitempty"`
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}
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func (i *InsertStatement) node() {}

‎ast/update_statement.go‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2,8 +2,9 @@ package ast
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// UpdateStatement represents an UPDATE statement.
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type UpdateStatement struct {
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UpdateSpecification *UpdateSpecification `json:"UpdateSpecification,omitempty"`
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OptimizerHints []OptimizerHintBase `json:"OptimizerHints,omitempty"`
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UpdateSpecification *UpdateSpecification `json:"UpdateSpecification,omitempty"`
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WithCtesAndXmlNamespaces *WithCtesAndXmlNamespaces `json:"WithCtesAndXmlNamespaces,omitempty"`
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OptimizerHints []OptimizerHintBase `json:"OptimizerHints,omitempty"`
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}
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func (u *UpdateStatement) node() {}

‎parser/marshal.go‎

Lines changed: 46 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2049,6 +2049,9 @@ func insertStatementToJSON(s *ast.InsertStatement) jsonNode {
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if s.InsertSpecification != nil {
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node["InsertSpecification"] = insertSpecificationToJSON(s.InsertSpecification)
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}
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if s.WithCtesAndXmlNamespaces != nil {
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node["WithCtesAndXmlNamespaces"] = withCtesAndXmlNamespacesToJSON(s.WithCtesAndXmlNamespaces)
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}
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if len(s.OptimizerHints) > 0 {
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hints := make([]jsonNode, len(s.OptimizerHints))
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for i, h := range s.OptimizerHints {
@@ -2284,6 +2287,9 @@ func updateStatementToJSON(s *ast.UpdateStatement) jsonNode {
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if s.UpdateSpecification != nil {
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node["UpdateSpecification"] = updateSpecificationToJSON(s.UpdateSpecification)
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}
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if s.WithCtesAndXmlNamespaces != nil {
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node["WithCtesAndXmlNamespaces"] = withCtesAndXmlNamespacesToJSON(s.WithCtesAndXmlNamespaces)
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}
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if len(s.OptimizerHints) > 0 {
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hints := make([]jsonNode, len(s.OptimizerHints))
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for i, h := range s.OptimizerHints {
@@ -2348,6 +2354,9 @@ func deleteStatementToJSON(s *ast.DeleteStatement) jsonNode {
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if s.DeleteSpecification != nil {
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node["DeleteSpecification"] = deleteSpecificationToJSON(s.DeleteSpecification)
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}
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if s.WithCtesAndXmlNamespaces != nil {
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node["WithCtesAndXmlNamespaces"] = withCtesAndXmlNamespacesToJSON(s.WithCtesAndXmlNamespaces)
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}
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if len(s.OptimizerHints) > 0 {
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hints := make([]jsonNode, len(s.OptimizerHints))
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for i, h := range s.OptimizerHints {
@@ -2358,6 +2367,43 @@ func deleteStatementToJSON(s *ast.DeleteStatement) jsonNode {
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return node
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}
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func withCtesAndXmlNamespacesToJSON(w *ast.WithCtesAndXmlNamespaces) jsonNode {
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node := jsonNode{
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"$type": "WithCtesAndXmlNamespaces",
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}
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if len(w.CommonTableExpressions) > 0 {
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ctes := make([]jsonNode, len(w.CommonTableExpressions))
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for i, cte := range w.CommonTableExpressions {
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ctes[i] = commonTableExpressionToJSON(cte)
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}
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node["CommonTableExpressions"] = ctes
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}
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if w.ChangeTrackingContext != nil {
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node["ChangeTrackingContext"] = scalarExpressionToJSON(w.ChangeTrackingContext)
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}
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return node
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}
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func commonTableExpressionToJSON(cte *ast.CommonTableExpression) jsonNode {
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node := jsonNode{
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"$type": "CommonTableExpression",
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}
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if cte.ExpressionName != nil {
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node["ExpressionName"] = identifierToJSON(cte.ExpressionName)
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}
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if len(cte.Columns) > 0 {
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cols := make([]jsonNode, len(cte.Columns))
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for i, col := range cte.Columns {
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cols[i] = identifierToJSON(col)
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}
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node["Columns"] = cols
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}
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if cte.QueryExpression != nil {
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node["QueryExpression"] = queryExpressionToJSON(cte.QueryExpression)
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}
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return node
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}
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func deleteSpecificationToJSON(spec *ast.DeleteSpecification) jsonNode {
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node := jsonNode{
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"$type": "DeleteSpecification",

‎parser/parse_dml.go‎

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Original file line numberDiff line numberDiff line change
@@ -8,6 +8,111 @@ import (
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"github.com/sqlc-dev/teesql/ast"
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)
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func (p *Parser) parseWithStatement() (ast.Statement, error) {
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// Consume WITH
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p.nextToken()
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withClause := &ast.WithCtesAndXmlNamespaces{}
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// Parse CHANGE_TRACKING_CONTEXT or CTEs
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for {
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if strings.ToUpper(p.curTok.Literal) == "CHANGE_TRACKING_CONTEXT" {
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p.nextToken() // consume CHANGE_TRACKING_CONTEXT
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if p.curTok.Type == TokenLParen {
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p.nextToken() // consume (
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expr, _ := p.parseScalarExpression()
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withClause.ChangeTrackingContext = expr
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if p.curTok.Type == TokenRParen {
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p.nextToken() // consume )
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}
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}
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} else if p.curTok.Type == TokenIdent || p.curTok.Type == TokenLBracket {
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// Parse CTE: name (columns) AS (query)
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cte := &ast.CommonTableExpression{
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ExpressionName: p.parseIdentifier(),
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}
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// Parse optional column list
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if p.curTok.Type == TokenLParen {
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p.nextToken() // consume (
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for p.curTok.Type != TokenRParen && p.curTok.Type != TokenEOF {
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cte.Columns = append(cte.Columns, p.parseIdentifier())
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if p.curTok.Type == TokenComma {
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p.nextToken()
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}
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}
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if p.curTok.Type == TokenRParen {
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p.nextToken() // consume )
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}
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}
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// Expect AS
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if p.curTok.Type == TokenAs {
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p.nextToken() // consume AS
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}
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// Parse query in parentheses
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if p.curTok.Type == TokenLParen {
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p.nextToken() // consume (
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queryExpr, err := p.parseQueryExpression()
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if err != nil {
59+
return nil, err
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}
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cte.QueryExpression = queryExpr
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if p.curTok.Type == TokenRParen {
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p.nextToken() // consume )
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}
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}
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withClause.CommonTableExpressions = append(withClause.CommonTableExpressions, cte)
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} else {
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break
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}
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// Check for comma (more CTEs)
73+
if p.curTok.Type == TokenComma {
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p.nextToken()
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} else {
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break
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}
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}
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// Now dispatch to the appropriate statement parser
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switch p.curTok.Type {
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case TokenInsert:
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stmt, err := p.parseInsertStatement()
84+
if err != nil {
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return nil, err
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}
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if ins, ok := stmt.(*ast.InsertStatement); ok {
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ins.WithCtesAndXmlNamespaces = withClause
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}
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return stmt, nil
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case TokenUpdate:
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stmt, err := p.parseUpdateOrUpdateStatisticsStatement()
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if err != nil {
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return nil, err
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}
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if upd, ok := stmt.(*ast.UpdateStatement); ok {
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upd.WithCtesAndXmlNamespaces = withClause
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}
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return stmt, nil
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case TokenDelete:
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stmt, err := p.parseDeleteStatement()
102+
if err != nil {
103+
return nil, err
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}
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stmt.WithCtesAndXmlNamespaces = withClause
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return stmt, nil
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case TokenSelect:
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// For SELECT, we need to handle it differently
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// Skip for now - return the select without CTE
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return p.parseSelectStatement()
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}
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return nil, fmt.Errorf("expected INSERT, UPDATE, DELETE, or SELECT after WITH clause, got %s", p.curTok.Literal)
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}
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func (p *Parser) parseInsertStatement() (ast.Statement, error) {
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// Consume INSERT
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p.nextToken()

‎parser/parser.go‎

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Original file line numberDiff line numberDiff line change
@@ -87,6 +87,8 @@ func (p *Parser) parseBatch() (*ast.Batch, error) {
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func (p *Parser) parseStatement() (ast.Statement, error) {
8989
switch p.curTok.Type {
90+
case TokenWith:
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return p.parseWithStatement()
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case TokenSelect, TokenLParen:
9193
return p.parseSelectStatement()
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case TokenInsert:

‎parser/testdata/Baselines100_CTEStatementTests100/metadata.json‎

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

‎parser/testdata/CTEStatementTests100/metadata.json‎

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

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