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str_expr.go
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str_expr.go
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package plan
import (
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/transform"
)
// AliasSubqueryString returns a string with subquery expressions simplified into
// static query strings, rather than the plan string (which is mutable through
// analysis).
func AliasSubqueryString(e sql.Expression) string {
e, _, err := transform.Expr(e, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
switch e := e.(type) {
case *Subquery:
return NewSubquery(NewStrExpr(e.QueryString), e.QueryString), transform.NewTree, nil
default:
return e, transform.SameTree, nil
}
})
if err != nil {
panic(err)
}
return e.String()
}
// StrExpr is used exclusively for overriding the .String()
// method of a node.
type StrExpr struct {
s string
}
var _ sql.Node = (*StrExpr)(nil)
func (s *StrExpr) Schema() sql.Schema {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) Children() []sql.Node {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) WithChildren(children ...sql.Node) (sql.Node, error) {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) IsReadOnly() bool {
//TODO implement me
panic("implement me")
}
func NewStrExpr(s string) *StrExpr {
return &StrExpr{s: s}
}
func (s *StrExpr) Resolved() bool {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) String() string {
return s.s
}
func (s *StrExpr) Type() sql.Type {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) IsNullable() bool {
//TODO implement me
panic("implement me")
}
func (s *StrExpr) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
//TODO implement me
panic("implement me")
}