Function MakeEvalContextStatic

pkg/expression/exprstatic/evalctx.go:490–529

MakeEvalContextStatic converts the `exprctx.StaticConvertibleEvalContext` to `EvalContext`.

(ctx exprctx.StaticConvertibleEvalContext)

// MakeEvalContextStatic converts the `exprctx.StaticConvertibleEvalContext` to `EvalContext`.
func MakeEvalContextStatic(ctx exprctx.StaticConvertibleEvalContext) *EvalContext {
	typeCtx := ctx.TypeCtx()
	errCtx := ctx.ErrCtx()

	// TODO: at least provide some optional eval prop provider which is suitable to be used in the static context.
	props := make([]exprctx.OptionalEvalPropProvider, 0, exprctx.OptPropsCnt)

	params := variable.NewPlanCacheParamList()
	for _, param := range ctx.AllParamValues() {
		params.Append(param)
	}

	// TODO: use a more structural way to replace the closure.
	// These closure makes sure the fields which may be changed in the execution of the next statement will not be embedded into them, to make
	// sure it's safe to call them after the session continues to execute other statements.
	staticCtx := NewEvalContext(
		WithWarnHandler(ctx.GetWarnHandler()),
		WithSQLMode(ctx.SQLMode()),
		WithTypeFlags(typeCtx.Flags()),
		WithLocation(typeCtx.Location()),
		WithErrLevelMap(errCtx.LevelMap()),
		WithCurrentDB(ctx.CurrentDB()),
		WithCurrentTime(func() func() (time.Time, error) {
			currentTime, currentTimeErr := ctx.CurrentTime()

			return func() (time.Time, error) {
				return currentTime, currentTimeErr
			}
		}()),
		WithMaxAllowedPacket(ctx.GetMaxAllowedPacket()),
		WithDefaultWeekFormatMode(ctx.GetDefaultWeekFormatMode()),
		WithDivPrecisionIncrement(ctx.GetDivPrecisionIncrement()),
		WithParamList(params),
		WithUserVarsReader(ctx.GetUserVarsReader().Clone()),
		WithOptionalProperty(props...),
		WithEnableRedactLog(ctx.GetTiDBRedactLog()),
	)

	return staticCtx
}