forked from src-d/go-mysql-server
/
time.go
264 lines (207 loc) · 6.96 KB
/
time.go
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package function
import (
"fmt"
"time"
"gopkg.in/src-d/go-mysql-server.v0/sql"
"gopkg.in/src-d/go-mysql-server.v0/sql/expression"
)
func getDatePart(
ctx *sql.Context,
u expression.UnaryExpression,
row sql.Row,
f func(time.Time) int,
) (interface{}, error) {
val, err := u.Child.Eval(ctx, row)
if err != nil {
return nil, err
}
if val == nil {
return nil, nil
}
date, err := sql.Timestamp.Convert(val)
if err != nil {
date, err = sql.Date.Convert(val)
if err != nil {
return nil, err
}
}
return int32(f(date.(time.Time))), nil
}
// Year is a function that returns the year of a date.
type Year struct {
expression.UnaryExpression
}
// NewYear creates a new Year UDF.
func NewYear(date sql.Expression) sql.Expression {
return &Year{expression.UnaryExpression{Child: date}}
}
func (y *Year) String() string { return fmt.Sprintf("YEAR(%s)", y.Child) }
// Type implements the Expression interface.
func (y *Year) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (y *Year) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.Year")
defer span.Finish()
return getDatePart(ctx, y.UnaryExpression, row, (time.Time).Year)
}
// TransformUp implements the Expression interface.
func (y *Year) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := y.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewYear(child))
}
// Month is a function that returns the month of a date.
type Month struct {
expression.UnaryExpression
}
// NewMonth creates a new Month UDF.
func NewMonth(date sql.Expression) sql.Expression {
return &Month{expression.UnaryExpression{Child: date}}
}
func (m *Month) String() string { return fmt.Sprintf("MONTH(%s)", m.Child) }
// Type implements the Expression interface.
func (m *Month) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (m *Month) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.Month")
defer span.Finish()
monthFunc := func(t time.Time) int {
return int(t.Month())
}
return getDatePart(ctx, m.UnaryExpression, row, monthFunc)
}
// TransformUp implements the Expression interface.
func (m *Month) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := m.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewMonth(child))
}
// Day is a function that returns the day of a date.
type Day struct {
expression.UnaryExpression
}
// NewDay creates a new Day UDF.
func NewDay(date sql.Expression) sql.Expression {
return &Day{expression.UnaryExpression{Child: date}}
}
func (d *Day) String() string { return fmt.Sprintf("DAY(%s)", d.Child) }
// Type implements the Expression interface.
func (d *Day) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (d *Day) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.Day")
defer span.Finish()
return getDatePart(ctx, d.UnaryExpression, row, (time.Time).Day)
}
// TransformUp implements the Expression interface.
func (d *Day) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := d.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewDay(child))
}
// Hour is a function that returns the hour of a date.
type Hour struct {
expression.UnaryExpression
}
// NewHour creates a new Hour UDF.
func NewHour(date sql.Expression) sql.Expression {
return &Hour{expression.UnaryExpression{Child: date}}
}
func (h *Hour) String() string { return fmt.Sprintf("HOUR(%s)", h.Child) }
// Type implements the Expression interface.
func (h *Hour) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (h *Hour) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.Hour")
defer span.Finish()
return getDatePart(ctx, h.UnaryExpression, row, (time.Time).Hour)
}
// TransformUp implements the Expression interface.
func (h *Hour) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := h.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewHour(child))
}
// Minute is a function that returns the minute of a date.
type Minute struct {
expression.UnaryExpression
}
// NewMinute creates a new Minute UDF.
func NewMinute(date sql.Expression) sql.Expression {
return &Minute{expression.UnaryExpression{Child: date}}
}
func (m *Minute) String() string { return fmt.Sprintf("MINUTE(%d)", m.Child) }
// Type implements the Expression interface.
func (m *Minute) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (m *Minute) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.Minute")
defer span.Finish()
return getDatePart(ctx, m.UnaryExpression, row, (time.Time).Minute)
}
// TransformUp implements the Expression interface.
func (m *Minute) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := m.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewMinute(child))
}
// Second is a function that returns the second of a date.
type Second struct {
expression.UnaryExpression
}
// NewSecond creates a new Second UDF.
func NewSecond(date sql.Expression) sql.Expression {
return &Second{expression.UnaryExpression{Child: date}}
}
func (s *Second) String() string { return fmt.Sprintf("SECOND(%s)", s.Child) }
// Type implements the Expression interface.
func (s *Second) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (s *Second) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.Second")
defer span.Finish()
return getDatePart(ctx, s.UnaryExpression, row, (time.Time).Second)
}
// TransformUp implements the Expression interface.
func (s *Second) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := s.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewSecond(child))
}
// DayOfYear is a function that returns the day of the year from a date.
type DayOfYear struct {
expression.UnaryExpression
}
// NewDayOfYear creates a new DayOfYear UDF.
func NewDayOfYear(date sql.Expression) sql.Expression {
return &DayOfYear{expression.UnaryExpression{Child: date}}
}
func (d *DayOfYear) String() string { return fmt.Sprintf("DAYOFYEAR(%s)", d.Child) }
// Type implements the Expression interface.
func (d *DayOfYear) Type() sql.Type { return sql.Int32 }
// Eval implements the Expression interface.
func (d *DayOfYear) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("function.DayOfYear")
defer span.Finish()
return getDatePart(ctx, d.UnaryExpression, row, (time.Time).YearDay)
}
// TransformUp implements the Expression interface.
func (d *DayOfYear) TransformUp(f sql.TransformExprFunc) (sql.Expression, error) {
child, err := d.Child.TransformUp(f)
if err != nil {
return nil, err
}
return f(NewDayOfYear(child))
}