Method ResolveAsType

pkg/sql/sem/tree/constant.go:515–546

ResolveAsType implements the Constant interface.

(ctx *SemaContext, typ *types.T)

// ResolveAsType implements the Constant interface.
func (expr *StrVal) ResolveAsType(ctx *SemaContext, typ *types.T) (Datum, error) {
	if expr.scannedAsBytes {
		// We're looking at typing a byte literal constant into some value type.
		switch typ.Family() {
		case types.BytesFamily:
			expr.resBytes = DBytes(expr.s)
			return &expr.resBytes, nil
		case types.UuidFamily:
			return ParseDUuidFromBytes([]byte(expr.s))
		case types.StringFamily:
			expr.resString = DString(expr.s)
			return &expr.resString, nil
		}
		return nil, errors.AssertionFailedf("attempt to type byte array literal to %T", typ)
	}

	// Typing a string literal constant into some value type.
	switch typ.Family() {
	case types.StringFamily:
		if typ.Oid() == oid.T_name {
			expr.resString = DString(expr.s)
			return NewDNameFromDString(&expr.resString), nil
		}
		expr.resString = DString(expr.s)
		return &expr.resString, nil
	case types.BytesFamily:
		return ParseDByte(expr.s)
	}

	datum, err := ParseAndRequireString(typ, expr.s, ctx)
	return datum, err
}

type constantFolderVisitor struct{}