Function nodeSelectExprs

server/ast/select.go:183–203

nodeSelectExprs handles tree.SelectExprs nodes.

(ctx *Context, node tree.SelectExprs)

// nodeSelectExprs handles tree.SelectExprs nodes.
func nodeSelectExprs(ctx *Context, node tree.SelectExprs) (vitess.SelectExprs, error) {
	if len(node) == 0 {
		return nil, nil
	}
	selectExprs := make(vitess.SelectExprs, len(node))
	for i := range node {
		var err error
		// Unaliased string literals use Postgres's ?column? placeholder as the column name.
		// We use a unique indexed sentinel rather than "?column?" directly to avoid GMS's alias
		// scope map conflating multiple unnamed columns in the same SELECT clause; the handler
		// translates the sentinel back to "?column?" on the wire.
		if _, isStrVal := node[i].Expr.(*tree.StrVal); isStrVal && node[i].As == "" {
			node[i].As = tree.UnrestrictedName(fmt.Sprintf("%s%d", UnknownColSentinelPrefix, i))
		}
		selectExprs[i], err = nodeSelectExpr(ctx, node[i])
		if err != nil {
			return nil, err
		}
	}
	return selectExprs, nil
}

// nodeExprToSelectExpr handles tree.Expr nodes and returns the result as a vitess.SelectExpr.
func nodeExprToSelectExpr(ctx *Context, node tree.Expr) (vitess.SelectExpr, error) {